"got the idea that we could also do the install ourselves."
I've done two simple Sanyo Mini-split installs and found it a little nerving racking when placing the orders.
http://ecorenovator.org/forum/geothe...l-project.html
http://ecorenovator.org/forum/geothe...ct-2011-a.html
Because, I didn't know if I would be able to do the job (without a rescue)
and I didn't know if these things would work in cold weather..
When you DIY install these systems, you need to check things with your supplier.
My supplier had a big page covering everything they will and will not do for you.
Some vendors want a professional installer, or else all bets are off.
Others think DIY is fine, if you have an HVAC pro come in and do the
final checks and turn on the system.
My warranty form had a place for the HVAC installer company name.
I sent it in, But I'm not sure if they even looked at it, when I needed a new
out-door unit (my first one leaked after working fine for over a month).
Once I convinced the support manager I had located the leak in the ODU
beyond any question, he instantly agreed to ship out a replacement unit.
I was able to repair that leaky unit and it's running again today..(My second install).
http://ecorenovator.org/forum/geothe...r-project.html
Now, I almost feel like I could install these things for a living..
There are a lot of DIY install videos on Youtube these days..
Check them out. Some are very good. But mostly, read your install manual.
That will help you to decide, how much of the install you want to do.