it shouldnt be too bad. you have all of the parts to do it, so it will just take time. if ya need a hand let me know, i wanna see how that thing fits in there.
depends how many rusty/seized bolts you come across. other than that it shouldn't be bad, time consuming but not bad, and if you switch your stuff you will want to switch over all the wiring harnessess too- that will be the fun part.
^^ well since it was already swapped once shouldnt all the wiring be all sorted out, so its only the stuff you need?
do i have to redo all the harness? or do i have to just take them out and put them in my new car. it wont give me a hard time right. it will just take a long time right.
Your JDM ECU is most likely spliced into your old car's ECU. You will need to unsplice it and resplice it into the new car's ECU. That is probably something you're going to want to pay an experienced electrical person to do. It can take anywhere from a day to several days of work.
^^^ that can be solved by switching the entire wiring harness, the whole car. pain in the arse but better than having to rewire stuff.