If you only do bike trails those things are unnecessary. SOmeone will always fix it for you. I know you're going to think I'm a borderline retard, but I picked my bike up from a repair a couple of weeks ago, and realized they had let my seat too far up. After about an hour it was really becoming an issue. I checked it out and realized that, embarrassingly, I couldn't figure out how to adjust it. (i know, I know). So I rode for about another 15 minutes and then it just got too uncomfortable, it was hurting me, so I had to do the thing. The thing is where you get off your bike and stare at it with your head tilted. This was my best time yet, this is completely true, it was literally under one minute, about 30 seconds, some guy comes peddling along, stops immediately, "is something wrong?". And he fixed it in about a minute.
Just a little tip for Watermark.