It will be really hard to get at first, all it takes is persistence. I was absolute shit when I first tried it but i kept at it and after a relatively short time I was just as good as my buddys who had been doing it for much longer.
However if you are the type to get bored with something quickly if youre not instantly good at it, its definately not for you. I have many friends that re this way and they just dont see the fun in slacklining at all because they dont want to put in the effort to actually get somewhere.
Also, weed helps
"Skiing isn't about who can look the best on camera and throw the biggest tricks, skiing's about getting out there with your friends and having fun."