Before you do that, take the air box and battery out, access the actuator rod and see if it moves freely...most likely not. Move it, use a pry bar to help if needed, spray some WD40 on the rod and push it in and let it return repeatedly this should free it up.
After that, take it for a good drive, wide on throttle, give it a thrashing, it'll get the turbo up to temp and hopefully remove some crud. I done this yesterday and mine hasn't gone into limp and the boost is way more stable.
Also if you do the above, youre half way there to doing a Mr Muscle clean, the remaining steps is to remove the EGR pipe and running Mr Muscle through it. It's not that hard, I didn't have to resort to a Mr Muscle clean just yet as I found my actuator rod was getting stuck when it went in fully, but since the WD40 and pushing it in repeatedly it's freed up.
If this is just a carbon issue, even paying someone a few beer tokens to whip that pipe off for you will be way cheaper than replacing the turbo. Unless your turbo is making demonic noises, or your exhaust is heavily smoking it would be better to try a clean first. Also if you don't get into the habit of this, there's nothing to say the replacement turbo won't end up clogged.
Some good for thought there.