I usually put new tips on myself every couple of months or so, but mainly because I end up filing the corners off of a couple of my own nails.
I have just done a set of sculpted pink and whites on myself, (not white tips) and I actually found it easier than using tips. It does take a long time to master doing your own nails, especially the opposite hand. I have never gone to anyone else to get my nails done, wouldn't trust anybody, except maybe my NVQ trainer.