It depends on how you look at it - for me, I do kind of enjoy doing my own tech work, so I don't mind the investment of time. If it's not something you enjoy, though, it may be "cheaper" just to pay someone else to do it, based on what sort of value you put on your time.
But yeah, action is a very personal preference, and some people like it higher than others - there's nothing wrong with bringing it back to the guy and saying, "listen, I tried, but I just can't get on with this." My only suggestion would be to get in touch with him soon and let him know you're, maybe not unhappy with the setup, but having a hard time getting used to the lower action, and ask him if after another week or so you still don't feel comfortable on the guitar, if he'd be willing to raise the action back a bit for you. If you come back out of the blue a month down the road, I suspect he'd be a little taken aback, whereas if you contact him soon after you get the guitar back he'll probaby just offer to comp you the adjustment free of charge.