I would say his personality should stay the same. They are very interactive typically if you have an aggressive one then you can tame it down. But if he is acting like this I would say your good. When they do get older though they will let you know when they don't like something though...wait till his first black beard....lol
As far as the basking temp....it is a smidge high. When they lift their feet up it is because they can feel it and its too hot. They do not have censors (so to speak) on their bellies....they do on their feet though.
With feeding....when they are little you want them to eat 80% protien and 20% greens. When they are adult that switches around the other way. Right now as a wee one....you want to offer crickets every day....as many as she will eat in 15 minutes. Make sure not to leave crickets in there with her unsupervised as they can attack him and eat at his toes or tail. Always always always dust your crickets w calcium w D3 and once a week dust with a multi vitamin. The only time you would use calcium w/out D3 is if you are using an all in one bulb like PowerSun or Mega Ray, T Rex, one that has UVA and UVB.
As far as a first pet....I would say absolutely!!! These make great pets for kids or adults. They have so much personality its amazing!!!! Just make sure your friend realizes its an everyday committment. If she goes on vacation...she has to find a sitter. Its chopping veggies everyday, cleaning, taking care of crickets as well.
Ok think I answered it all...if you have any more questions please feel free to ask away.