Hi, my friend.
In my opinion, you shouldn't do any pruning or heavy training on autoflowers during the vegetative stage because their veg period is very short. If the plant gets stressed, your final yield can drop so much that all your hard work might leave you with nothing more than a couple of joints' worth of buds. 😂💚
So, avoid pruning autoflowers during veg. During the flowering stage, if you want to improve your yield, I'd only recommend using LST (Low Stress Training), since it puts much less stress on the plant than topping or heavy defoliation.👽