you can totally LST the plants.
I tent to wait till they are about 3-5 weeks old before doing anything to big but start slow and keep it gentle and even. Don't want to stress them to much as they are autos and when an auto gets unhappy they enter early flower. On a previous question I posted some link on how to LST, if you follow that guide and look at others grows using LST it should suit you well.
Best Of Luck!
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