its a pure but it can be done,did you remove the oil return pipe under the turbo ( 2 bolts hold the steel section on to the lower turbo body and a clamp down near the sump,this give some access to the bolts,you
just have to try and get a good spanner on them maybe a bent one,as they come loose you will have to lift the turbo and follow up as you loosen,soak in plenty of wd40 or releasing agent and give it a bit of time.best of luck