Spend time hear, research & learn.
Don't be afraid to ask a question (even if you don't like the answers given)
Spend time hear and you WILL learn a lot!!
I used to have 5% all around, damn dark at night.
15% is not too dark when you get used to it. Make sure it's legal if you want it on the front windows. Here in Texas I believe 20% is the darkest you can go
Well, like they say in the engine business "Speed cost money...how fast do you want to go?"
But yes the electrical to back it up can be quite an investment.