Rancher gave you some great advice. The biggest problem people have when making a purchase like this or a vehicle is they treat it loke a personal transaction rather than a business transaction. You have to always keep in your mind that this is business. No matter how much you love the unit, treat it as business because there is always another one out there somewhere. It is your money, so you have the control in the situation. If it ever seems like you are not in control, walk immediately. If you not confrontational by nature and only wanting to look, plan to have another appointment that you can't miss an hour or so after you get to the lot and then use that as an excuse.
I've left more than one dealer after the high-pressure sales tactics. If I'm just looking, I make that very clear from the start. In fact, I've started the car replacement process recently and went to drive a couple of models that I'm interested in. As soon as I met the salesmen, I told them point blank that I'm in the very early stages of deciding what vehicle I want and I've done all the research I can do without physically driving the vehicles, so that is what I'm doing now. At both dealers that remain on the list, the closest either sales person came to any pressure at all was to simply say that when I'm ready, they would love to earn my business. At no point was price asked about or discussed. The only one that fell off of the list tried the ol' "What will it take to get you to buy today?" tactic to which I politely advised him that there was nothing he could do as I was still deciding which vehicle I liked best. He fell off the list because I didn't like the vehicle as much, not because of his question as he didn't push it after I responded.