indoor trainer and cheap cyclometer. Know how to start,most poor TT rides start with a blow up, which can include but not be limited to:
going out way to hard and fast.
getting your heart rate to 200 and realizing the race is almost over before you calm down. Trying to do funny things with your position and gearing. What makes guys think they can turn over a 54 or 55 chainring is puzzling. If you can ride good TT at home without pauses and rests it will tell you the story, get on your bike,achieve a speed after lets say 4 to 5 minutes and maintain it for 10 to 15 without cracking. It's way harder than it sounds no matter what your target speed is. The key is even if you fail you will still be vastly improving as you work toward the goal. Until you can go sub 1hr or 55min in 40k all the wheels,helmets and skinsuits are silly props. Guys at the top of the game work on TT skills all the time.