Very briefly.....
Drain oil
Engine cover off and remove rail and connections for coils.
piping from and to airbox off
Top heatshield off
Undo downpipe from turbo and flange on front pipe and also bracket holding in place along with heatshield and remove downpipe / cat.
Disconnect coolant hose from hard pipe on turbo and drain what you can by cracking Banjo bolt and angling hard pipe down then unfo rear Banjo for coolant (quite a bit will spill)
Undo and remove oil return and feed banjos and prepare for some mess.
Undo manifold heatshield and remove, this will come out with persuasion past piping with banjos removed.
Remove manifold complete with turbo from head.
Swap turbo's on bench and have a very hard look at manifold for signs of cracking, mine was properly dead at 63,000 miles.
If there is any sign of clogging of oil feed and return lines then remove from car and either clean or replace. Oil banjos should be replaced along with sealing rings.
My lines were perfect but I cleaned them anyway, Auricks were quite bad I think.
Put back together in reverse with new oil and filter and refill and burp cooling system. My coolant was almost new so didn't bother draining and renewing. If not been done recently, pull bottom hose from rad and empty system before removing cat and replace it.
I maybe missed the odd step out but you'll see it when you get started if so. I did mine over a weekend and took my time it is easily doable in a day if nothing gets stuck, an afternoon if there is two of you with one underneath. Plenty of releasing fluid, new gaskets, studs, and nuts should be on hand and only attempt it if you have decent SIX point sockets.
Fill turbo with oil from top once lower pipe is on and follow general advice on priming before running.
Quite involved job but not too bad provided nothing shears or rounds off, mine came to bits no problem but I had time to spray it s down and wait. Not joking about only using 6pt sockets.....
Good luck!
Ben