The instrument rating is one of the hardest checkrides short of the CFI ride. In instrument flight, the best thing you can do and what you train to do is stay ahead of the airplane. The good thing about flying approaches is everything is very structured and your checklists will get you through. Some things you can do to start getting ahead of the aircraft:

-Unless you live in a very congested area of airports you will probably find yourself flying the same approaches consistently during your instrument training, go home at night and brief those approaches 'til you are briefing them in your sleep

-Start setting up for the approach as soon as you know what approach you are flying, the sooner you get through the brief and checklists the sooner you can get back to flying the approach

-On that note, if your instructor/examiner does not mind, use the autopilot as much as possible during the setup.

-If your instructor hasn't already pointed this out, the glide slope becomes more sensitive as you get closer to the approach end of the runway so prepare for this don't use abrubt control movements to correct for this as you may see yourself overcorrecting the opposite direction. If a 500 FPM descent kept you on the glideslope before 1 mile from the runway keep it in as you pass that FAF

Hope this helps, there are more tips I can think of that I might post later but help yourself by reading the through the Instrument Flying Handbook and looking over those approaches. Don't worry about anything just yet, through repitition approaches will get to be the easy part. Learn and prepare for the instrument oral as soon as you can.