I've Just About Had It!

Sometime, late last month, I got around to picking up some new brake pads for my MTB.  After watching several YouTube videos on how to do it, I felt confident in my abilities.  Well, those pads sat on a garage shelf for a few weeks before I got around to installing them.  When I finally had time to make the switch-aroo, I realized that my hex wrench was too small.  After some scurrying around, I found an Allen wrench that was able to remove the necessary screw nicely.  This was, per the videos, the reservoir for the brake fluid.  Once off, I wasn't really sure why that needed to be done, so I put it back in place and surveyed the scene again.  I saw the pin that the videos said needed to be removed, but not several of the other components mentioned.  Well, at this point, I figured, "why not", and just dove right in.  I removed the pin, pulled out the pads, and the metal clamps keeping them put.  Hmmm, that's it?!?  The pads were out.  According to the video, there was going to be brake fluid leakage and several more steps to follow.  Well, that was easy!  The one thing I did remember, was to make sure that the calipers were pushed all the way back, before installing anything, or replacing the wheel.  OK, done.  I now go to install the new brake pads, and, wait for it.......................they don't FRIGGIN' FIT!  They are the wrong ones!  I specifically told the dude, at the shop, that my brakes were Avid Elixir 1.  When he handed me the pads, I verified that they would, indeed, fit and went so far as to tell him the exact model bike while reiterating what brakes it had.  His response was a very positive, "Yes"  @#$%@!@#$!@#$^#$%&$%^*!  This bike is really, REALLY, starting to piss me off.  Honeymoon over I guess!  So, 4 or 5 more days go by and today I make a return trip to the shop.  I bring the old pads in and tell the guy (one that I've worked with for years now) and explain what's going on.  He quickly recognized that the pads I was holding wouldn't fit what I'm riding.  DUH!  What the?!?!  He disappears for a while and comes back with news that I really didn't want to hear.  They didn't have any of my correct pads, and wouldn't have any until Friday!  ANOTHER return trip!  Now, you may be asking yourself, why do I keep returning to this shop?  Quite honestly, their prices can't be beat and they have been good to me for going on 6 years now.  The few bumps I encounter aren't big enough for me to look elsewhere for my biking needs.  So, until Friday, another week goes by with no mountain biking.  Hopefully, HOPEFULLY, I'll get this rectified this weekend and will report back about a glories trail ride.