My advice is don't put off learning it, as soon as you can. Start now! My instructor had me try a switch turn pretty much as soon as I'd managed a regular one and I thank him for that because i intuitively did it and have never feared it since that day.
I've always made a point of immediately trying the switch version of whatever I've learnt regular. Blue run top to bottom on the first day of my second week, cross under carves, powder, spins etc. I've even caught myself having to look at the board on occasion to check which way I'm riding
Technique wise, I find simply running through a quick mental checklist is all I need: weight centred, feel the pressure on each foot (shuffle backwards and forwards a couple of times if need be), are my shoulders inline with the board, where are my hands. (That process has largely shifted to my subconscious now though). Everything else just takes care of itself then. It might take a couple of turns to really get in the flow but that's it.
BUT, despite a good start, the more I've ridden (and it's not been anywhere to 50/50) the less confident I feel riding switch relatively speaking. I'll ride switch if the board happens to be pointing that way but I'll tent to revert before to long unless I force myself, particularly if it's steep or challenging.
SO to underline what many others have already said: force yourself to do it, set goals big or small but set them! And then keep doing it. Theres just no substitute for snowmiles whichever direction you're pointed in. And if you're finding it difficult that goes double!
Just don't give up because you tried it a couple of times and it didn't work out.
As a baby you couldn't walk. It took you a LOT more than a couple of tries to crack that... Remember what kind of perseverance you are capable of