gearbox swap

Hi, probably been asked before, so if there's a link someone could send me... Otherwise, looking for assistance for R154 manual box swap from auto. 1) can you leave engine in situ. 2) can you use auto prop shaft 3) do you need to change ECU 4) is replacement pedal box easy to find ie...

Hi, so first of all I don't know pretty much anything about engines and what's compatible with what, hence why I'm here. Anyways, I have an Is 200 and I've been looking at an Is 300. I was wondering the Is200 gearbox fits the 2j in the Is300, and how would I make it fit? Also on the same note...