iv just replaced my turbo yesterday,, there's 3 bolts, all m8 and the thread size is 1.5m the 2 that go in the block are about 10m long the other one that bolts the mount to the turbo is about 20m-25m
there pretty easy to get at,, with some axel stands
bolts require a 13 socket/spanner to fit them,
the drive shaft does obstruct you a bit but you can get around it