It's probably not going to sound as good as if you had a nice setup, but it will work... you'll go home with something.
One time I went to see Susan Tedeschi expecting to open tape with my big rig, but got shut down. I didn't have stealth mics/preamp, just the bare R09, so I ran the built in mics, with the recorder on the table. Personally, I think it's one of the worst quality tapes I've ever made, but some people really liked it.