It's not too bad.
You will, more likely then not, never get rich doing it but it is good for supplementary income.
I am a notary for work and have considered getting into the mobile loan closing side of it. A lady I know does it for her retirement income and doesn't seem to mind it. My biggest problem is the loan companies. Evidently it is a fucking circus when it comes to getting the docs to you. I know she is constantly down to the last minute waiting on them, printing them off, and getting everything in order.
At first you can't necessarily charge at the high end or decline or accept what you want. You kind of have to do everything (including getting that missing signature) whether you want to or not in order to build your reputation. After a while you can start being more discerning.