Will they provide a document stating my total gains or losses, or am I responsible for totaling these things up and reporting them? I did a lot of trading earlier in the year and I can't find a simple solution for totaling anything; almost looks like a nightmare.
Trading means little, just add up your deposits and withdrawals see which is bigger and report the difference, that's your profit or loss.
Remember unless it's a deposit or a withdrawal, then you haven't actually made a trade, it's all within the virtual world of the exchange and what you think you have done isn't real until you withdraw it.