Assuming you are referring to connecting rod bearings and not main bearings:
Use a socket and ratchet to remove the bolts holding the bearing cap in place. With the bolts removed, tap around the perimeter of the bearing cap with a soft hammer until it is loose enough to be pulled off by hand. Be careful not to damage the crankshaft or bore when removing the bearing cap.
Once the bearing cap is off, remove the old bearings from the bore. Clean any debris or old grease from the bore with a clean rag. Check for scoring or damage on either surface of the bore. If everything looks good, lightly oil both surfaces of each new connecting rod bearing and press them into place in the bore.
Install the new bearing caps, being sure to line up any punch marks made during disassembly. Torque down each bolt in a star pattern until they are all tight.