Charlie if you just want the tiller pilot to steer a course, you can get away with a pretty simple install...
2 wires (with an inline 10amp fuse) to the battery... drill a hole for the socket (comes with rubber backing to watertight it)... 4 screws... connecting the wires to it is easy, they are screw terminal (tiny screws)... the socket is 5 pin, you need to mark the 2 power you need, but that's pretty easy. Pin in the tiller, 90 degrees between tiller and TP, and 18-20 inches from the pintles.
Each manufacturer has pedestal mounts (raise the butt), and tiller extensions (if the TP has to be farther away), there are also drops to put the tip end lower at the tiller... for lots of ways to set the tiller pilot up level (when the boat is at rest and flat).
This all sounds way more complex than it really is (so lemme post some pictures of my present install, keep in mind that the TP I bought is also simnet, and NMEA 0183 connections so more wires). So anyway... A Raymarine ST1000+ with just steer to course, is pretty straightforward...
This is my S2 7.9 as I said.. but, here's the TP butt end pin.
So the tiller should be pretty flat... I used a board to get placement... This is showing my TP22 Simrad.
This is the ST1000+ on my Capri 25... so the tiller is on a post through the floor, simpler install in my mind... but maybe it'll make more sense seeing this... note the pin in the tiller... you must epoxy it in. but if you drill the hole the right size, the epoxy is actually more to hold the pin from coming out, than in place.
Now that I've had a tiller pilot, I won't single hand without one (if I can afford to avoid it).. I sailed for 2 seasons with no Tiller Pilot, when I sold my Capri 25, I bought the S2, I was ready to install my ST1000+ on the S2, but when I chose Simrad instruments, I wanted a TP that integrated with it. So I sailed it for about 10 outings with no TP... I can do it just fine, but I missed it. Yeah, I actually missed a stupid piece of electronics.
So I sold my TP to the old owner (nice guy, sold it cheap)... and put the money towards the simrad instead. My point in upgrading from the ST1000+ to the TP22 on the S2 was the S2 has a pretty heavy tiller so I wanted to go up in size, and I wanted the niceties of steer to apparent wind..
So now I have GPS, with DSC, knotmeter, depth, temp, and windspeed, wind direction, stereo with bluetooth, LED running lights, and a tiller pilot integrated to the steer to wind, and GPS (steer to course)..... on a flipping 26 foot boat (yeah I'm not quite right)... But my goals are to sail the boat in bigger waters so I want some "safety" touches... DSC is a biggy as is a beefier tiller pilot. New(er) sails will be on the horizon next...
But seriously I think dollar for dollar the Raymarine ST1000+ (as opposed to the Simrad TP10), which you can later add integration to raymarine electronics for steer to wind, etc... is probably a great product for the single hander for the Capri 22... when you step up to the ST2000+, then the Simrad TP22 is similar in price and functions.