First I do firmly believe that most people do not notice if your wearing a diaper or not. I guess some have had reactions (mainly due to the diaper being seen poking out of shirt or pants) but for me I have never even gotten the slightest hint in look or glance by anyone when wearing in public. I also layer so my diaper wearing is quite bulky (especially when fully wet).
So for new users or old ones - just do not worry about it - do wear black pants or slacks incase of leaks. Do not wear a short tailed shirt so that when you bend over the diaper shows. Personally I do not think that most people you meet in public want to see your diaper - that is your head trip not theirs.
Most people will assume in glancing at your butt that you just have a big butt and that is all, not that your wearing a diaper.
The trick in enjoying wearing and peeing in public is to enjoy the flow. Yes some do enjoy flooding and that can be fun at times. However I have found that constant feeling of leaking and when you do feel the urge to just let it flow is even better (feeling wise) than the flooding. This does have its advantages. First of all you can totally fill a diaper by just letting it flow instead of flooding. The diaper will be able to absorbe the pee if it is not over taxed. Second you get to enjoy that feeling of the pee flowing out of you. I do find that sensation of the pee flowing out of the urethra, and especially when it is just dripping out constantly to be not only a great feeling but a constant sexual stimulation. This is not to say you go around aroused all day but it is as if you had somone just gently licking you and keeping you wet.
I also find that the main thick to total enjoyment is doing what is necessary to really feel your not going to leak - the kitchen garbage bag and plastic pants is the way to go in acheiving this. The bag acts like bloomers and the pants adds that additional mental safety feeling.