Most guys are cool with you asking them how to properly perform a lift with good form and all. Of course, you need to use common sense about when you ask. For example, If you're are curious about how best to perform squats and I'm across the gym doing bench press, it might be the right time to come ask me that. However, if we are doing bench side by side and you think I look like I know what I am doing, then give me a friendly inquiry between sets while I'm not huffing and puffing.
I only meant that I don't actively offer advice to guys I don't know. Usually I get some type of ego response that they know what they are doing even though they clearly don't. Or the other annoying thing, that Casey Butt also points out in his writings, is as soon as you offer up advice some other little guy comes over that starts reciting stuff he just read in a fitness magazine! Some guy that doesn't appear to have ever really done any weight training.
And as far as hitting up the local and present personal trainer for advice this can be hit and miss from my experience. Some guys will briefly answer your question but then want to sign you up. Or some guys can actually shine you on all together feeling like you want something for nothing. And there are some good guys too don't get me wrong. Like I said, hit or miss.