I just got this last week. I wanted to to install it immediately, so I started before I had to go to work, and had it installed in about 15 minutes. You can probably install it faster if you first get the right sized Allen wrench for your toilet seat lol.

It is so easy to use, however I recommend that you sit down before you test it, unless you're looking to wash the opposite wall.

 It is not intrusive and it's a very short learning curve in  that I figured out to turn it slowly and about where I like it strength-wise in a couple of uses. Amazing! So much cleaner than toilet paper. I suggest if you're not able to get a full bidet, get this.  Love mine!