That is a 1988 Fat Chance with rear cantilever mounts (not a Wicked - would have a W at the end of the serial number)
To remove the pressed-in bottom bracket bearings:
Secure the frame in a suitable stand or frame vise
Loosen the allen-head set screws on one collar on one end of the spindle and gently tap the spindle until it slides out (WD-40 or equivalent helps here). Leave the other collar installed so you will have your dimension set when you go to reset the spindle. Remember which side you left the collar on
Insert a 3/8" drive ratchet extension (1-foot long preferred) through one of the spindle holes in one bearing and angle it so the end of the extension is up against the inside of the opposite bearing. Strike the extension with a suitable hammer to knock out the bearing (go easy) tap all around the bearing to get it started - you don't want to risk ovalizing the BB shell.
Once the bearing is out, you can tap the other bearing out in the same manner.
Clean out the inside of the BB shell, check for severe rusting and repair if needed.
Coat the inside of the BB shell with a suitable rust preventer but make sure the areas where the bearings contact the shell are perfectly clean and dry.
To install:
If you are re-using the old bearings, make sure they are clean.
Run a small bead of Loctite Red around the outside of each bearing shell
Place each bearing into the shell by hand and line each one up as close to concentric as you can.
Once each bearing is in place, slide a bolt through the bearing spindle holes that is lone enough to engage both bearings. Use soft washers on each end to prevent damage to the outside of the bearings. Install a nut on the other end and use two wrenches to slowly tighten the nut and bolt. You will see the bearings being pressed in to the shell. Tighten slowly enough to make sure both bearings are properly engaged in the shell. Continue to tighten until the lock rings on the outside of the bearing shells contact the bottom bracket shell.
Reinstall the spindle from the side that you removed it with the collar still on.
Install the collar on the other side and tighten the set screws.
Let the Loctite set up per the manufacturer's instructions.
Install your crank arms, set your chain and ride accordingly!
I know we had instructions for the bottom bracket bearings (and use to sell an installation tool) and those instructions are probably on this website somewhere if you care to look for them. (Google may help too)
Good Luck
Scott