My daughter uses a pump and she copes very well with it, both her and I much prefer it to when she was on injections. Going onto a pump is the best thing that's happened to us as far as her diabetes is concerned. I think it's been a positive experience due to a number of reasons which include: It's improved my daughter's blood glucose control where injections were failing, we went into pumping with a good understanding of what was involved and how it would benefit her, we all (daughter, myself and care team) supported the decision to start pumping.
Going onto a pump is a decision that should be made by your son, your care team, and you. You are your child's carer, your son won't be able to do everything by himself at this young age, so you do need to be on side in the agreement to start pumping. You may be uncertain about a lot of things so the meeting that has been arranged with your DSN is an opportunity to ask lots of questions and find some answers to your concerns.
Carb counting is something you should learn, even if your son wasn't going to get a pump. It takes out a lot of the guess work with diabetes and gives you a better chance at getting those good readings more often. Sometimes you will still have to guess the amount of carbs but with experience your guesses will become fairly accurate. It seems difficult and time consuming to start with but after a while it becomes much easier and quicker to do as you get more experienced.
Use this forum and your DSN to ask about whatever is concerning you, doesn't matter how silly the concern might be. I find things are far less daunting when you know the facts or can hear of other people's experiences.
When you get the pump you usually are offered a trial period where the pump is loaded with saline. This gives you and your son time to use the pump without any risks if you get things wrong. It's an opportunity to learn your way around the pump menus, do some set changes and generally get a feel for what it's going to be like using a pump. Pumping doesn't always turn out to be the best thing for everyone, remember that you can always decide that pumping isn't for you and your son and return to injections. If your experience is anything like ours then you won't want to give the pump back!