Did this failure in the last sim ride and although looks daunting when reviewing the checklist/QRH everything falls into place easily when actually doing it. As WBD said, use GS for a good reference when you are close to the ground but be wary of it at the higher levels as it might mislead you due to the difference between TAS and IAS at higher levels.
One of the first things to do as per checklist is to switch off A/P, F/D, and A/THRUST and take-over flying manually which will put you back in the loop.
If altimeter data is still OK, the Flight Path Vector will be very useful especially to maintain level flight once you are stabilised.
Going into the approach it is very important that you don't let the instructor rush you and take a reasonably long approach to allow yourself time to configure the flaps as per QRH.
In fact the most "critical" part of the excercise is the intial phase where you have to identify the problem but once you have established a safe flight path it should not be problem.
Hope this helps.