Obviously Technical Analysis alone won't help you to a successful trade. It has to be a combination with other factors such as Risk management and those you have mentioned
I have been using TA for sometime now since late march this year (it's the time I decided to do serious trading and I have) and i have made something like 32% profit though i haven't been consistently trading daily yet. I think i would have made more if I was trading full time.
Quite very effective if you are willing to taking small profits per trade and not be so greedy.
Technical analysis including luck is the best way to earn prpfits, I agree for that way not to be greedy, taking small prpfits for the daily trade very effective is enough.
A small profits can get for daily trade job 10 to 15 percent interest, add their a weekly earning I think from small to become huge.