As Big Daddy Kaine and Ice-T like to say, "Patenting ain't easy"
There is a lot of work. If you want to save money and have to the time to learn how to do it yourself, the book recommended
Patent-It-Yourself is a wonderful resource.
However, as laid out in the book, claims drafting can be difficult and possibly ineffective without some experience and mentorship.
Don't skimp the claims, make sure you are humble to ask for help, and do your best!