I spent many hours helping my dd to get her straddle press to handstand. That's many hours of my life I'll never get back, but it gave me some insight!
Try learning them in two stages.
First the straddle lever to elephant stand. You will need to really push down into the floor (imagine you're pushing the floor down/away and keep your arms strong, to give you any chance of swinging your legs out.
You need to strengthen your wrists and your shoulders, as you'll go over on your wrists and your arms need to lean forward in the first 'press' bit.
Stage 2 is elephant stand to handstand. Try standing with your feet raised on something (panel mat, sofa cushions) and hands on floor to begin with and slowly work to being able to straddle up to handstand from with floor.
Try doing them against the wall, with your hands not too far away from the wall, then you know you wont go over and you can concentrate on getting a good wide straddle.
Focus on rolling your back up the wall from shoulders to hips, until your bottom is against the wall and then start to lift your legs, so they come around the side. If you life your legs too early, before your back is upright, they will pull you back down.
I'm sorry, but from my experience two weeks is hopeful. It's one of those skills that just needs working at and can take some time to get the control, but good luck.