Mine also changed my quality of life. I too was allergic to pretty much every kind of tree, weed, grass, as well as dust and dust mites and a few other odds and ends.

I went from feeling like I constantly had a cold, no sense of smell, frequent sinus infections, couldn't go anywhere without a wad of kleenex, etc., to being completely medication-free and able to breathe freely.

It is a huge burden at first but once you get into maintenance it is pretty easy.

I can't imagine my allergist ever letting people give themselves their own shots...the liability in case of a systemic reaction would be huge. I did once have a systemic reaction and it would have REALLY sucked if I hadn't been in their office.