Your best bet would be to do some searching on how easy it is to do a 2j swap...
It all depends on how much $$$ you want to spend on the swap.
For me the choice was easy... A fully rebuilt 7m-gte was availible to me from a friend that had is car written off. Going 7m-ge to 7m-gte was a sinch..
1: Pull old Motor W/ harness and ecu
2: Install new motor
3: Plug in harness
4: Plug in Ecu
turn the key.
There were a few little things you need to deal with but nothing major like finding new motor mounts or different bell housings or anything liek that.. but I did have a few issues that came up, nothing bad tho. one was that I was using an auto harness with a manual ecu and tranny.. so had to jump the neutral safety switch.... and I also had to double check my grounds before it finally turned over. After that it was just setting the timing and I took it for a drive. And then a couple odds and ends to deal with, like finding boost leaks, diagnosing codes (ya code 52), and getting everything running right, but that is common with most swaps.
Oh.. and to prove how easy the 7m-ge to 7m-gte swap is... I did it in 3 nights (working from 6pm to 1am).. and I had never done a motor swap before and did most of the work myself, I had a buddy to help speed along some of the wrenching and to help muscle the motor in place but other than that it was me.