100 pages is a lot, but there are absolutely no circumstances under which a non-lawyer should finalize an equity round of finance without legal representation.
Even if it you don't care about yourself, or any future employee who might be saddled with the currently unknown 'gotchas', you will still be screwing friends/family investors and your spouses and children. Seriously, get a good attorney.
It's an accepted and expected part of finance that you will incur some legal costs getting a round of financing done.
All that said, if this is an angel round, that document is too long. A good angel or group will want to keep it simple, and leave the major lawyering to a Series A. But overall, a) congratulations! and b) suck it up, and go get the best lawyers you can find.
