Yes can be done from above.
Inlet manifold off. (Allen keys)
Oil feed (likely to break, will need replacing) I used a flexible one.
(Underneath)
Down pipe off,
Oil drain off,
May need driver side inner arch off to get to the pipe to the intercooler off.
Unbolt exhaust manifold and it will come out the top.
Get genuine or second hand, I've had two cheap recon ones and both failed, one in 1000 miles (London turbos)
Make sure you prime the turbo with oil.
If you fit a recon, warranty will be void if you fit it yourself.