The cartridge fill on the X2 is a PITA. Just accept that and move on with the rest of the X2 functionality. You have the ability to run the infusion sites as long as you want. The pump gives a reminder to change but you can ignore it until your insulin runs out. If you have low insulin needs, this could be a long time.
I strongly suggest do not run past 3 days on an infusion site for any reason.
But mostly you just have to try the X2 pump out and play around with it. Reading the entire pump manual cover to cover is a very good idea. I suggest read the manual entirely before using the pump. After using the pump for a month, read the manual again.
Spend some time picking out a decent case to carry the pump in. Probably easier if you typically wear a belt but clearly options are available for times when not wearing a belt. Don’t just stick with the case that comes in the box.
The pump needs to be charged (internal non-replaceable rechargeble battery). It should last 5 days when running in X2/G5 integrated mode or 7 days when running non-integrated (with cgm). Easiest approach is just plug it in when you are in the shower. That usually is all it takes. Carry around one of those portable USB batteries (the ones about the size of a stick of chapstick are very convenient) as backup power source.