If you intend to fly long term (I know most people probably intend to fly long term, but still give up fairly quickly) then I would suggest that you go and buy yourself the best ANR headset that you can afford.
This will reduce noise-a big cause of fatigue. It will also make radio communication much clearer and easier to understand/learn, thus speeding up your training and saving you money.
One other thing to findout is how to adjust the squelsh on your intercom (if possible). Sometimes an incorrectly set squelsh means that you have a constant background shhhhhhhhhhhhhhhh noise. When this happens, it is EXTREMELY tiring, but easily eliminated by turning the correct knob
Don't ever under estimate the tiring effect of background noise.
Also practice your circuits/radio calls or what ever part of your training you are on, when at home, in the bath, driving to work....wherever you are. You are trying to train your brain to do these automatically without having to think about them. When you can do these automatically, it's one less thing you have to do in the air, which will help free up your mind
dp