The signage is very good, but the secret I used to do before I became familiar with WDW was if I got there early and had a little time to kill, I would drive around and see where everything was in relation to where I was staying. It made things much easier when I was ready to go to a specific place and took away all the anxiety of getting there.
Once you have done it with your own vehicle you will never go back to the bus system. It's so much easier and way less stressful driving yourself to the parks. It offers flexibility and, in a lot of cases, speed to the process contrary to what you may have heard or read. I found that many times the amount of time waiting for transportation would have had you at your resort and probably even in the pool by the time the bus even gets there.
In other words, don't worry. Even if you don't use my "pre-trip" procedure, it is very simple, just pay attention to the signs to be sure you are in the proper lanes. Even if you aren't, there isn't much to getting back on track again.