Yes Do it yourself, my hubby did. He tied a length of strong thread around it at the base TIGHT, This restricted the blood flow to it, after about 10 days it went black & shrivelled up and dropped off,
(we found it in the bed) he's got a small white patch where it was but its oh so much better.
Mind you there are skin tags and skin tags, if yours is big or bigger a visit to your GP would be best, but yes they can do it for you, you don't feel anything because they freeze it. Well worth it if you're worried.
Good Luck Jem