hell no it's not too early.. i've done them earlier then that... you just have to make sure and don't get any pieces of the side sprouts pinched or obstructed too much...i like to use pipe cleaners.. to peg them down.. but sometimes you even have to use bread tied if they are too small so not to pinch/obstruct
you can go for it now you would just have to be careful. If you wait a week or so for those aux. shoots to develop more it will be easier to tie down without hurting those (not that its hard to do)
here is a plant i started late... anyone on here telling you can't do it... or there is no use in doing it now.. has either never done it.. or never did it correctly... you start now cuz when you PEG it down (no1 is talking about tie'n down) you expose the side branches to the light and they explode in growth.. and it causes the main cola to explode w/growth because it keeps try'n to be the highest part of the plant but you keep pinning it down...... there's more then one way to skin a cat.. and about a fucking billion way to LST... and the longer you wait the easier shit breaks...just do some google'n and see what ppl manage to get their plants to do... if you can dream it up... you can do it....don't believe the hype....and don't let anyone discourage you in your grow