One clip of a limb not really gonna hurt your final yield, plus it gives you something to look forward to come harvest, its very tempting to clip as you grow, espically when you have no bud, lol. This is where a sog, might come in handy, as these bud sites are often left behind, and need more of a healthy trimming, lol. Their are benefits to hacking down a few lower branches, all your nutes are directed to the bigger bud sites, and not wasted on bud sites that don't receive as much light (Promotes faster growth among the top).