I really felt like I needed it. Sitting down on the toilet and getting back up are not easy in the first 2-3 weeks, plus it generally puts you close to ninety degrees. That isn't breaking the rules, but I found it uncomfortable for the first 4 weeks to get close to ninety degrees, plus you feel pretty darned nervous at first when your leg goes the way it isn't supposed to go. Don't get me wrong, I hated the thing, and was HAPPY to retire it at 4.5 weeks, but glad I had it.
Oh, and your nervousness is totally normal. I think I started five threads when deciding whether or not to move forward. I ran 4 miles the Monday before my Wednesday surgery, as my hip was behaving. However, my fitness life had dramatically slowed, and I was only exercising sporadically. I knew that I would continue to do less, and become more miserable, if I didn't get it done. I could be largely pain free if I was sedentary, but unhappy. So, I'm on the way back. I think you have to decide how important it is for you to remain active (and pain free). If that's something important to you, then go for it. The pain of recovery (for me at least), is very fleeting.