$18...$20...Looks like I rounded it off.
And even Hung started with 1 tank.
Look, I am not challenging your desire to have it done by someone who has done it before. There is nothing wrong with that. Just weighing the options though, I think spending a couple of bucks on a piece of glass from the local hardware store, making about 5 practice drills will be plenty of practice. Then once you have successfully drilled your own tank, you have a skill and commodity that becomes pretty sought after.
Maybe my thought process is different but I factor in things like the 2 hours round trip that I will have to drive (If I lived in the QC and went to Hung's) plus how easy it really is to do it yourself.
Again, it wasn't meant as a challenge to what you did. It was meant simply as a weigh your options and future plans before you do anything.