if u planning to do H22 swap off ur eg, u have to sacrifice the ac due to space issue.
look in honda-tech.com, its been covered millions of times since ages ago.

as for b18c swap, its a straight swap. watch for the driveshaft splines, tho. but other than that, its a straight ones given u got a complete kit (motor, gbox, driveshafts, ecu, shift linkages, wiring harnesses & obd2>1 harness). check honda-tech