"How did you get to the point you could tackle Calculus? " After working through Strang's Calculus and learning how to tackle proof questions (strangely enough

"How did you get to the point you could tackle Calculus? " After working through Strang's Calculus and learning how to tackle proof questions (strangely enough I got confident enough to attempt proof questions after working through a good chunk of "Concrete Mathematics" (Knuth)) I then found what was impenetrable before in Spivak looked attemptable, if not easy. It helps that the end result of most proof questions are known in advance and the problem is finding/writing down the proof itself. nce I got to that point, then grind, grind :-P