We generally don't encourage indecision threads here on the 405th - there are as many different opinions on what you could construct as there are people to suggest them, so in the end, it's really best for you to decide for yourself. Remember: you will be wearing the finished product, not us, so it's very important for you to choose something that you will be happy with.
As for discouragement: put simply, don't let it get the better of you! If you're finding a piece difficult to work with, or you're simply finding that you don't have the skill and experience to tackle more complex parts, try something a little more simple to help yourself get into the flow. Don't force yourself either, you'll generally find that your best results come from patience and wanting to work instead of finding it a chore. If you're new to Pepakura, try a simpler piece to get yourself familiarised with the process - I could recommend perhaps scaling up a boot or a shin, perhaps a shoulder plate, and working on that until you're comfortable with moving onto something a little more complex. If all else fails, don't be afraid to put your tools down and take a break - sometimes I can go weeks without working on something. Remember, it's a marathon, not a sprint, and rushed work is never good work.
Above all else, however: have fun and don't be afraid to ask for help! Good luck with your build!
