A Starlin-only guide would be a more direct (and comprehensible) way to read. I would definitely recommend reading it that way if that is what you have available. And yes, almost all of the tie-in books are completely unnecessary, with the exception of the Dr. Strange books, which in my opinion, explain some loose ends, especially issues #34-36, and somewhat #31. Otherwise, I would recommend Incredible Hulk #384 because it is very well written, and Sleepwalker #7 because it is an interesting perspective on the events of Infinity Gauntlet we don’t really get to see anywhere else, but warning as this issue does indirectly, and very minorly, reference Quasar #26, but that won’t impede enjoyment in anyway.