Ablation Soon, Advice Please

(18f)I’ve never had any kind of surgery, operation, or procedure ever and I’m freaking out. I have Atrial Tachycardia and Atrial Flutter and I just scheduled an ablation for this month. My highest bpm was between 250-260 and when I got the results of my 2 weeks holter monitor it had 750 episodes of SVT and 1 episode of VT (which I actually don’t know why). I know I need the ablation, but I have absolutely no idea how to prepare or what to expect. I haven’t had coffee or sugar for the past couple weeks to try and lessen the episodes and symptoms in case that will help and I am also on a medication that isn’t really working.

Please if theres anything I can/should do beforehand or if anyone is able to explain the process that would be so extremely helpful! All I know is that i’ll be in a twightlight state and they said it should take 2 1/2 hours