the problem is that micras are usually people's first cars, so we get a lot of people on this club around the 17 year old age limit and they want to turn their car into a rocket, so they ask how to swap the engine but they probably have never even changed the oil in their car.
it happens a lot and people get sick of the "how do i put an SR20 in my micra" questions.
people are a lot more willing to help when you have actually started the project, so (if it was me) start by searching the net, not just the forums, about the engine, which car it comes from, its dimensions, power output, and what cars it comes in, what kind of brakes might be needed, fuel pump pressure etc. then take the engine out of your car (if you can't do this because its a daily driver or you don't have the space, then thats a good sign to give up) once the engine is out, take a look at the bay, measure it and see if the engine is going to physically fit, which we already know because the conversion has been done before. get the new engine, put it in place, and see what has to be done to secure it, so which mounts have to be modified etc. same with the coolent pipes, gear linkage, drive shafts etc, most of this is pretty obvious and you will understand exactly what needs to be done when you start the project, like if something is in the way you will have to move it etc.
once you have got this far, then is a good time to come back to the club for the more complex questions like wiring, or good places for custom drive shafts etc.
its only because we have so many people asking about these things with no real intention of actually doing them, the threads are there if you search you will see how many times people have asked about these things before!