Just FYI, the mods here don't like it when threads are repeated. You might want to keep it to one introduction thread and maybe respond back to those in the other thread that welcomed you. Maybe go over and check out the general discussion or residential HVAC sections of the site.
The statement below is my signature and just my overall feeling towards our industry and does not necessarily pertain to you nor this thread.
There really isn't a legitimate excuse for not doing the job correctly!