The Holley system is very widely used and there is an abundance of information online (especially YouTube) about using it. When I put the EFI 6 pack onto my Challenger I went with the HP system because I was already using a FAST EZ system on my 73 Cuda. The EZ system is non tunable, you just have to let it do its thing, however the HP system is exceptionally tunable. After watching some YT videos and talking to some people it was awesome to work with/on.
Imagine setting up cold start RPM, fuel and spark with never turning a wrench, same with idle, hot start and WOT. It is not all that difficult and you don't have to become a true "tuner" to get some benefit from it, but as I said if you really don't want to do anything you don't necessarily have to as it will self learn. Now I have to be honest and tell you that you will need a base tune which can be obtained from a wide variety of places to include Holley.
When I got my HP system I knew 0 about tuning, I grew up with Carbs. I bought my system from a guy who initially told me that if I bought from him I would get unlimited support, he would set everything up, blah blah... So I thought this would be perfect for me and placed my order, then I find out that he basically just places the order with Holley and has them drop ship it to me. Once I got it all installed and went to start it I called him to make sure everything was good. He started asking me what tune I had in it and told "the tune you put in it" to which he said he never put anything into the ECU because it shipped straight from Holley... We ended up writing a tune over the phone right then, took like 2 minutes... Long story short I discovered it was not at all magical and completely doable.
There are lots of books and info out there and I know it can be a bit intimidating but it is not that big of a deal.