rear CBI is fairly easy. I've installed it twice by myself. Helps to have another person, but its doable solo.
no experience installing CBI's front, but i've installed a hefty and a shrockworks...bolting locations are similar, just different plastic trimming.
By any chance did you ever pass through Oxnard,CA? I saw a 4Runner that looked just like yours around here. Made me wish I’d bought the hefty front bumper.