How hard is it to drop the front subframe out of a Th and replace it with a TL subframe compared to just doing the steering rack?

Bolt out bolt in is the simple answer, is the best way to go as generally the later stuff will be newer and often with less mileage. Keep the pump attached to the rack and do the lot at the same time

Thanks for your reply. Sorry for the delay, unexpected events. I was wondering how difficult this is as a job?