Yeah, do get someone who knows photography at least for some pics. Relying on a bunch of cell phone or P&S users likely won’t result in anything more than snapshots. Candids and snapshots are fun and welcome, but you’ll want at least a few really good photos.
Those high price photogs that make their photography part of “the show” are rarely worth it, tho, imho. (I used to be in that same market) Ask your volunteer photo buddy to record the event well, but be unobtrusive. Of course, for any group shots, you’ll need someone able to direct others.
I had a fellow photographer do our wedding. We bartered services.
Instead of a caterer, we had several friends who offered to bring something. We asked another friend to help coordinate the effort, so it was not out of balance. I gave her some money myself, probably about half the bill of what ended up being there. We did finger foods and refreshments instead of a meal and liquor.
We got married on a ranch in northern Colorado. I made the arch, my fiancee decorated it. The rest was pretty much just the beautiful house and surrounding. It’s nice that a dear old family friend offered her place.
I bought a new suit, needed one anyways, and my wife and her friend made her own dress.
I see a theme in my post. If someone offers you something (help, doing something, covering the cost of something), take it! Thankfully, my wife has some talented and giving friends, and I had some good trade connections. If you are a part of a church or any social group, talk it up there. You might be surprised how many people would like to be a part of something.
Of course, ymmv, and you do have to watch out for those who tend to take over.