I know how you feel.
Im currently pulling out the
ca out of an S13 (mine) for an Rb20 and the
Rb20 is coming out of an R32 (friends) thats getting an Rb25.
So far the rb20 is ready to go into the S13 and the rb25 is almost ready to go into the r32.
The wiring side of things is something that I have NO idea how to do, so getting a pro to do the s13 $150ish is the quote and R32 I bought a loom from Japan that had already been converted to run an Rb25 and then getting a pro to do the little bits and pieces to make it tidy, $300ish including the loom from Japan.
Everything else has been easy so far and as long as you do the research before hand you shouldn't have any problems, just leave the wiring to a pro and do the other bits on your own.
As for tools I used a $70 tool kit from K-Mart to pull the ca out no problems at all and had everything I needed. You will be surprised how much doing research helps and makes it look easy if you have a step by step guide. Give it a shot, you can always get it towed there later.