It's all down to personal choice, preference and if you can talk your doc into signing the insurance papers (if not dealing with insurance, then that's less power they have to say yes or no).
Personally, I'm a BIG fan of being able to handle your diabetes with shots BEFORE the pump. Even with the pump, there are times (though sometimes rare, but for me a number of times) you will still need to take a shot, or have to go without the pump (such as when/if it breaks down and you are waiting for a replacement).
I have had diabetes for over 16years and have tried the pump but it wasn't for me. I prefer shots and grew up being the one to give myself a shot at school..not like know a days where some parents expect the teacher push the buttons on the pump and take that responsibility and because of that, I personally think it's good to have some time on shots (whether it be pens or syringes) before going on the pump, so that in those moments when you need to take a shot ortemporarily go back onto shots..you KNOW what the hell you're doing and less likely to make a mistake because you're scared of the needle, etc.
But that's just my personal opinion. After having tried the pump, I doubt I will be going on it again unless the technology improves drastically by the time I'm ready to try it again.
Like I said above, it's really a personally choice as to when you go on the pump. If you REALLY want to go on it, then talk to your endo and make them see your point of view. My endo didn't want me to even try the pump when I first asked about it last fall and I left in tears (now looking back, I kinda wished I left it at that! haha) but I called him back the next day and explained WHY I really wanted to try it, and he agreed. Pretty simple in the end to get the OK to give it a 3month trial.
In the end, they are there to help you after all, they aren't in charge.