Yeah...don't burn or snip the leaves. :thumbsup:

If an exceptionally young plant, you are removing a major percentage of her photosynthesizing ability. Of course it will slow her down.
Later in life (in flower) if you remove the fan leaves, the stalk it was attached to will stunt a tad depending on how many you remove. (might stunt a tad, might stunt a bunch...yield can suffer)

Nutrients and additives are not recommended till the plant can handle them. Usually after the fourth or fifth node is showing. Any soil additives should be added when you next transplant. (guano, castings, bone meal, michorizae fungi...or whatever you use, if anything)