why?
If you follow my tip it's really easy.
There's the bolt on the front of the turbo(coolant feed I think). Just use a socket and take it off. On the T25 there might be a bracket in your way. OK, just use a 10mm socket/wrench and loosen one end of the bracket, that will be enough to swing it out of the way to get a socket on the coolant bolt.
And then for the rear drain bolt, if taking the turbo OFF, remove the coolant drain bolt from the BLOCK, not the turbo. That rear coolant bolt is a bitch to get off/on and that's why you remove the one on the block and not the turbo. So when you pull the exhaust manifold off, that line will still be bolted on to the banjo bolt on the turbo. The coolant bolt on the block is easy to get to w/an extension and a socket. Comes right off.
Reverse of install. Rear coolant bolt goes on FIRST to the turbo(easy to get it on when turbo is off the engine), then install turbo w/exhaust manifold, then bolt up to block the coolant line. Then finally the front coolant bolt which just needs a socket.
Doing this makes it pretty easy. Why the problems?