I have a tournament coming up in a month, so my prep is the following:
Guard transitions... if you can get the basic four guards into muscle memory, then they will become your flinch response when things go south and you have no idea what's happening. Never underestimate the value of pulling Ochs (especially) or Pflug when all else fails... it tends to clear the area in front of you and get you some breathing space. Practice the guards diligently and ALL THE TIME.
Cuts. Do Meyer's cutting exercises again again and again. Do them advancing and retreating. If you have a good length to travel while doing it (a soccer field, say), then do the first cut sequence again and again, all the way to the end of the field, and then do it with retreating footwork all the way back. Then do a light jog (up and back) the same distance to rest your arms if you like. Then use Meyer's second cutting pattern and do the same thing. Wash, rinse, repeat.
Master Strikes. The best thing to get down is a good vorschlag. Have each Master Strike as hard and fast as you can make it. Then learn two techniques for each one, so you have an option for either a hard or soft bind for each master strike. Have a plan if the opponent closes to grapple, or if you're a good wrestler, have a plan to do so from each bind. However, I've found that in tournaments people tend to retreat more often then they should, making Ringen am Schwert less likely than other options. If they do close, a good shove to the opponent's elbow as he closes often suffices.
The first thing to go all to hell under pressure is footwork, so practice that as much as you can stand.
Also, visualize yourself winning, and also visualize combatants in front of you as you practice techniques. Creative visualization is an important skill to develop. And it's fun.