I do this sometimes, but unless the TB happens to be something I REALLY REALLY am interested in, I usually wait before I revisit the cache to pick it up. I've missed out on a few TBs, but no hard feelings here.
In the meantime, if the newbie really wants to help the TB along, he can demonstrate his motivation by being quicker.
Thats the exact "good and experiecned" adittude I would expect from people, You know that we all can't be super cachers and collect all 3 million of them, heck I cant even find time usually between school, marching band, cross country, music lessons, home work etc. but I make the effort to find the cache anyway and that what geocaching is about