Dog walker?

I am about to start a job that will keep me out of home from 8-5ish. My dog is trained to potty outside and I don’t want to break all that training by making her relearn to use a pee pad. All the dog daycares in my area are very expensive. I have seen the dog walkers are quite a bit cheaper than a full daycare but the idea of someone coming into my home kind of sketches me out. Is it worth getting one or should I steer clear?