ps- i'm also nervous because i won't have lantus or anything like i do now
You'll be fine! I felt the same way when I was on saline for my pump trial. I've been on a Minimed pump for over 2 years now and I love it. It's so much better than shots, and when you need to do a correction, you don't need to take an extra needle. THis is great for me because I am really afraid of needles!
And what you're saying about Lantus isn't exactly true. Instead of having an insulin that lasts the entire day, 24 hours, with one shot (lantus), you use the fast acting (novolog/humalog?) and take very small amounts every hour (your basal rate). So you'll be fine. Just because it's a different type of insulin doesn't mean you won't be able to control it better.
And yes, if you don't like the pump, you can switch back to shots. Just make sure you give the pump a decent try-- it takes a few weeks usually to finetune basal rates.