You really only need a good suspension lift if you plan on doing moderate-hardcore offroading, otherwise it is kind of a waste of money. Coilovers (which is what you linked) are more for hardcore offroad use.
You could get away with some bilsteins+FJ springs, or if you really want to cheap out you can just get a simple spacer lift, but that doesn't include swapping out the springs and shocks and will not improve the ride quality. These run for ~$200 to get a full 1.5-2" of lift all around but it doesn't improve your ride quality, it only lifts you a bit.
Of course all you linked was front coilovers, and that set doesn't include anything for the rear. To get something similar for the rear you would need some more springs and shocks and you're looking at another $300+ for those.
For example, I love offroading and rock crawling and I go pretty frequently, I'm actually going to easter jeep safari with some friends next month. I ordered this lift
Radflo 2.0" 03-Current 4Runner Suspension Kit for mine and will be installing it by myself when I get it in the next few weeks.
Installing looks to be pretty easy as long as you have all the tools. Watch this video to get an idea of how it is done, and you can do your yourself in a weekend to save some money.
https://www.youtube.com/watch?v=m9-0hMzv_RU&list=WL&index=1 This video is for a true suspension lift though.
If money is not an issue, then going all out with coilovers for the front and new shocks/springs for the rear should drastically improve the offroad ability of your rig along with the ride quality.
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