Here's how I would go about it:
First, get yourself half a dozen small containers (margarine tubs, paper cups, whatever) so you can put the various screws and fasteners from each set of panels in a different cup. This will make it much easier for you when the time comes to put everything back together.
1) Move the windshield to the highest position.
2) Empty the pockets in the fairings, and leave the fairing pocket covers open.
3) Remove the mirror covers on each side. Disconnect them from the retaining strap (one small Phillips-type screw), and disconnect the electrical connections. Set the mirror covers aside.
4) Remove the mirrors from each side (two 8mm bolts each). Set them aside.
5) Remove the two plastic tip-over guard covers (one large Phillips-type screw each). Set them aside.
6) Remove the triangular black plastic part (mudguard? Front of engine cover? "Inner Lower Cowl", in Honda-speak) that is directly behind the front wheel. (two Phillips-type screws and numerous push-pins). It might not want to come out once you have removed all the fasteners - if not, don't worry, it will probably fall down once you finish step 7.
7) Remove the black belly fairings ("Lower Cowl", in Honda-speak) from the bottom of each side of the bike (numerous 5mm hex-head bolts, and a few push-pin fasteners up at the front). Be aware that there are a few push-pin fasteners directly underneath the motorcycle, at the very front.
8) Remove the big side panels ("Middle Cowls") from each side of the bike. These are the panels that cover the engine on each side, they will have a logo on them that says "ST 1100" or "PanEuropean". They are held on by some 8 mm bolts near the tip-over bars, a few small Phillips-type screws up by where the mirrors were, and an assortment of 5 mm hex-head bolts. You might want to take some pictures showing where all the fasteners are before you take these panels off - they have the most fasteners of all. Be aware that there are two screws under each fairing pocket cover that need to be removed, and also two push-pins inside the hole where the forks are (about an inch down from each fairing pocket) that need to be removed to get these large panels off. Also be aware that there are a whole bunch of push-pins inside the aperture where the radiator is that need to be removed.
To manipulate these big panels off the bike, pull them outwards (sideways) at the lower back, where your foot goes when you ride the bike. Then, stick your hand into the fork hole and pull the panel upwards about one inch to clear the inner panel (where you removed the two push-pins). Finally, move the entire panel forward a few inches to disconnect it from where the mirror mounts are.
You could, I suppose, remove the small plastic panels that are inside either side of the fork hole, after you have removed those two push-pins. That will save you having to lift up the big side panel one inch to clear those two inner panels.
9) Remove (loosen and lift up an inch or so) the "Inner Screen Cowl", which is the upper front-facing part under the windshield. The windshield retaining arms stick through this piece. It's held in place by push-pins (not all the same, so pay attention to what shape of push-pin goes where when you take the pins out). You don't have to remove this part from the bike (that would require windshield removal), just remove the pins holding it and lift the whole panel up about an inch so you can get to the next step.
10) Now remove the "Upper Cowl", which is the part below the windshield with the word 'Honda' on it. It is held on by two screws, one near each mirror. You probably removed these screws without knowing it during step 8.
By now, you will have very good access to the back of the entire headlight assembly. Chances are that you won't need to remove the headlight assembly from the motorcycle in order to accomplish whatever you have set out to do.
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