DIY AC recharging:
Directions on on the bottles but if you have any doubt on the location of the low pressure side fill valve see below.
Handbrake tightening if you've never done it before:
Simply pop off the center console/parking brake handle cover and see how dirty it is underneath there
Now find your adjustment nuts. Not the top nut is a jam nut so loosen it first, then tighten the lower nut.
You'll need two 10mm wrenches or might be able to use a deep socket.
Adjust until you reach the recommended number of clicks (found in your manual...which I don't have) I tightened my to 8 clicks as I recall my old GC manual had said 7-9.
I tried squeezing in blacking out headlights but weather had another idea.
I did manage to fix my air horns as two of the three had blown diaphragms.
(it's so lonely now)