FSS is dead simple. Whatever controller you have, it's a lot easier and quicker to use a mouse for the FSS.
You need a button to enter and leave the FSS. Use the scroll-wheel click if you have one otherwise any button/key you want. You have to bind it as "Enter FSS mode" in the Mode Switch section and "Leave FSS mode" in the FSS section. use the same key. Why they want to do it twice and offer two different ones is a mystery.
You need two axes to move the curser around the screen, which is the normal mouse movement, set in the lower part of the FSS section. You probably want Yaw inverted.
You need two buttons or an axis to move the tuning right and left. Use the scroll wheel - scroll forward for one and back for the other
You need two buttons for zoom in and out. use the left and right mouse-click buttons.
You will have to adjust the sensitivity of the tuning and the mouse movement after you try it because it depends on your mouse sensitivity and how you have it set in Windows, Mine was too slow on the tuning and too fast for the main curser by default.
That's it. ignore everything else.
To honk a system is even easier. presumably you have something already bound as your primary and secondary triggers. You activate the main discovery scanner under the "firegroups" tab in the right hand panel. I recommend put a number 2 against it and use your secondary trigger. If you only ever will do exploration, then you could put it on trigger one.