A basic invert is, unfortunately, a move that could really go wrong, even if you think it's going right. Best thing I would suggest is to work on some other things! Try doing some spins, see how they work, learn about climbing and gripping the pole with your legs only- these will help you to prepare yourself for a basic invert!
And, if you're really chomping at the bit for it, you could do some conditioning exercises specifically for the basic invert! Look up Dirdy Birdy on Youtube: she's got some great tutorials that also have conditioning exercises in them. Being able to slowly lift your legs to your chest while holding the pole with your hands, at head height, is one of those things you HAVE to be able to do!
I've worked toward the basic invert for almost 4 years! I'm only just getting consistent with it now. I've had a lot of downtime from the Pole, granted, but I had to go at my own pace.
Things to remember for the Basic Invert: NO Jumping, keep your hands lower than you think they should be (like, face-level), and if you feel any kind of pulling or twinging in your back, shoulders, arms or neck... stop doing it! You're not ready!
I wish you luck! I'm sure you can get to this one a lot faster than I have if you work on it ;)
There are also some other moves that get you upside down, and their lead-in moves. Look up the Plank, and the Cross Knee Release, and the Cross Ankle Release.