Jobs at small Providence companies nobody posts about - any advice?

I asked around at a community meeting and got three leads. There are 5 people counting on me, so I am trying to be careful. One is a print shop, one is an accounting firm and one is a clinic. Should I visit in person?

Thanks for writing this out. I went through something close to it last year, and it settled down once I kept a simple log of every call and form.