wallflips are fun haha i got mine before the standing backflip. i would reccomend trying to use a tramp to get over the fear of going backwards, then when you do the wallflip, run at the wall slowly, preferably close so you dont have much time to think about it and psyche yourself out, and jump
UP and put your foot about chest height, then just kick that sucker down and back. try to shoot yourself at a 45 degree angle. i know, this technique is horrible for normal backflips, but you're on a wall. just run up to it and jump back and
up as much as possible without flipping, and then go for it. think of it realistically, you're already a quarter done with the flip when you kick off the wall.
take a look at this,

see how i'm at that angle when i'm on the tree? now all i have to do is make it 90 degrees and i'm completely upside down. at that point, do you know what can help me? HANDS ding ding ding! if you're too afraid, use hands! and let me tell you, wallflips are VERY easy, and you get pretty high due to the position of your foot. soooo it comes to these three things.
1. Come at the wall at a decent pace
2. Place your foot somewhere in the mid/upper torso reigon
3. Kick that sucker down and hard. to make you go
UUUUPPPP and back.
remember to go up. and nature will take over making you rotate backwards while being far away enough from the wall to not hit it.
the wooing of the ladies will come later.
oh, and i did these in converse when i first learned them, so as long as you can wallrun it, you can wallflip it. its actually easier to wallflip it due to the angles, but remember to be safe.