Now that I've pointed out what to do and not what to do when you go for that first order, let me give you some suggestions on dealing with the bartender once your on their good side. We all know that bartenders, like hairdressers, are good for venting your frustrations and giving advice. Don't take it personally, we do have to earn a living. I have to finish with one last thing. I've been bartending for way longer than I care to admit, and in this time I've met some of my dearest friends through my job.
Bartenders are just people doing their jobs, just like everyone else.