how do i replace wheel bearings and front hub on 1990 ford probe?

You'll need to replace the hub. It comes with the bearings. Remove the wheel. Remove the brake components, Unbolt the Lower control arm, unbolt and slide the half-shaft out of the hub, unbolt the hub and reverse the procedure. It won't be easy if you don't have the right tools or knowledge.

ok- you must love your Probe very, very much- create an alter to the gods of Ford- (starts with Henry)- say 1000 "Hail Henrys" before you even get your wrench out- be careful when jacking the car up, blocking it, banging on it with hammers, pullers, pry bars and giganto wrench- are you sure you don't wanna just pay a pro to do this?

You will need a machine press in order to get the old bearing out and back in. But you can save some money by taking the Steering knuckle and hub assembly to a mechanic. To take out the steering knuckle/hub assembly your will need a 32 mm socket to take out the spindle nut. There is an indentation on the nut that will need to be flattened out with a chisel or screwdriver before you can rotate the nut. You will also need a breaker bar and maybe an extension in order to get enough torque to loosen the nut. To keep the rotor from moving so you can unscrew the nut, you can 1) Insert a bolt within the brake caliper and rotor to keep the rotor from moving. 2) Wedge a pry bar on the lugs and the ground 3) Have the car on the ground with the wheel on assuming the nut is exposed. Then take off the brake caliper if you have not done so already. Remove the anchor plate using a Phillips screwdriver. Remove the brake disc. You can tap on with a hammer to help slide it out. Remove the two bolts that secure the steering knuckle to the strut housing. Remove the balljoint clamp bolt and separate the steering knuckle from the lower control arm with a ball joint separator or pry bar. Remove cotter pin from tie rod and remove the bolt. You may need a hammer to separate the tie rod from the steering knuckle after the bolt is removed.