When I'm unsure I try to figure out a way to ask questions without it looking like I'm asking questions :-) If you thought you were maybe supposed to start the practicum earlier, I would have pretended to be all excited and asked the site person or advisor, "Can I start now or should I wait until Monday; I can't wait!" It makes you look like a "go-getter" when you're just trying to get information. I always volunteer to help people with things, too, because most of the time they will turn you down so you don't have to do the work but you appear to be a helpful person, LOL. If I get caught out and taken up on my offer, that's okay, I am a helpful person actually (if a bit lazy :-)