The ATPL groundschool is fine as long as you do the study each evening. You won't have a problem as long as you don't allow yourself to fall behind with your studies. If this happens you reach the point of no return(!) very quickly, I've seen it happen.. .It will seem difficult at first, but it quickly dawns on you that you are studying the subject you live for! Then you enjoy it and it becomes easier(plus you are used to the routine by then)
Have fun, all the best! <img src="cool.gif" border="0">