Need diagram for replacing front hub assembly on

Barbara, Check the attached links, door mechanism.
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for what vehicle

For front wheel assembly diagram and replacement,click the link below and go through procedure:----Front wheel hub assembly Diagram and replacing procedure? http://howtobyme.blogspot.in/2012/02/front-wheel-hub-assembly-diagram-and.html
----------Front wheel assembly diagram to replace wheel bearing? http://howtobyme.blogspot.in/2012/02/front-wheel-assembly-diagram-to-replace.html
-------------How to replace Front wheel bearing? http://howtobyme.blogspot.in/2012/02/how-to-replace-front-wheel-bearing.html
-----------Check all 3 links one by one.This will help.Thanks.

there is probably a small cover on the 'back' part of the mmirror housing, by the corner front part of the window/door=pry it back, it will expose small bolts/screws that hold the housing to the door.

Removal & Installation Front To Remove:
The front wheel bearings are not serviced separately. If the front wheel bearings are defective, the hub and bearing assembly must be replaced.

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Lubricate the threads on the halfshaft with clean engine oil.
3. Remove or disconnect the following:
   • Front wheels
   • Halfshaft hub nut
   • Caliper from the steering knuckle WARNING
     DO NOT allow the brake hose to support the weight of the caliper.
     
   • Brake rotor
   • Anti-lock Brake System (ABS) sensor from the backing plate
   • Hub and bearing assembly from the backing plate
   • Hub and bearing assembly from the halfshaft
   • Hub and bearing assembly

To Install:
Exploded view of the front hub mounting and related components

1. Install or connect the following:
   • Hub and bearing assembly onto the halfshaft
   • Hub and bearing assembly to the backing plate. Torque the 3 bolts alternately and evenly to 70 ft. lbs. (95 Nm).
   • ABS sensor
   • Brake rotor
   • Caliper on the steering knuckle.
   • Halfshaft nut. Torque it to 118 ft. lbs. (160 Nm).
   • Front wheel. Torque the nuts to 100 ft. lbs. (140 Nm).

These are the steps you need to follow for this procedure if you have the proper tools.

1. Remove front caliper assembly and rotor from the steering knuckle as outlined under "Caliper, Replace" in the "Disc Brake" unit repair section.
2. Remove hub and bearing to stub axle retaining nut.
3. Disconnect hub bolts then remove hub and bearing assembly from steering knuckle by sliding it straight off end of stub axle. If metal seal on hub and bearing assembly is seized to steering knuckle and becomes dislodged on hub and bearing assembly during removal, or when removing hub and bearing, the finger disc on hub becomes damaged, hub and bearing assembly must be replaced.
4. If hub and bearing will not slide out of knuckle, insert a prybar between hub and steering knuckle and gently pry hub and bearing from knuckle.
5. Tighten stub shaft nut, lower vehicle and with brakes applied, torque stub shaft nut to 70 - 90 ft. lbs.

You can pick up an entire re manufactured axle assembly at your local auto parts store. In order to replace the assembly you will need to disconnect the tie rod end and the ball joint. Remove the spindle nut. Push the axle stub out of the hub. Now with a suitable container under the axle to catch spilled fluid pry the axle from the transmission housing. Install is the reverse of removal. For more detailed instructions and diagrams go to www.autozone.com vehicle repair guides.

8–Stud Rotor

1. Raise and support the vehicle.
   
2. Remove the wheel.
   
3. Remove the hub extension.
   
4. Remove the brake caliper assembly.
   
5. Remove the axle nut cotter pin. Remove the axle nut.
   
6. Disconnect the ABS wheel speed sensor wire from under the hood. Remove the sensor wire from the frame and steering knuckle, if equipped.
   
7. Back off the hub/bearing mounting bolts 1/4 inch each. Then tap the bolts with a hammer to loosen the hub/bearing mounting bolts.
   
8. Remove the bolts and remove the hub/bearing assembly.
   

you need to buy the whole assembly. i know what you mean. I have a '68 coronet that still has the origional wheel bearings in it, and now they don't last 5 years. ( and they wonder why they're all gone broke)
No, it shouldn't blow up, but it will keep getting worse, and it probably does affect your mileage, somewhat.