Buying the parts is easy, your challenge will be to find a good shop that can pull the engine in order to install the turbos and injectors. I suggest using tt.net to get opinions on the shop you will use, unless of course you or your husband will be doing he work.
You may also want to install new split down pipes as long as you are going to all the expense of new turbos and injectors. With the engine out have all hoses, wiring, motor mounts, etc. checked so you can replace anything that is bad. If the timing belt has not been changed, now is the time to do it when the engine is out of the car. May want to consider removing the EGR. It’s easy when the engine is out. If it’s a 5 speed, now is the time to check the clutch.