I just removed my engine from my 02 WRX and I think the biggest problem I've see people come across with the removal was getting the engine and trans to separate.
I didnt have any problems with my removal but every car is different.
There are plenty of videos on YouTube to browse upon that might help you to start with.
Blue masking tape and a black marker will be your best friend during this time.
Good luck man.
Cobb Accessport Stage 2.
JDM ej205 swap.