OK, I'll throw my $0.02 in:
+1 on:
1. letting the glue cure overnight; this is key in my book
2. replacing tubes on the road, patching at home
3. patching multiple tubes at once
After I have peeled & applied the patch, I use the backside of a soup spoon to work it back & forth pressing on the patch from edge to edge. When the plastic wrap on the topside of the patch comes loose, I know it's 'done'. But no harm in leaving that wrap on either.
I always put a newly patched tube in an old wheel/tire, pump to max & let sit overnight to fully bond the patch under pressure. If still inflated in the AM, I know it's good to go. Then powder it, put into a baggy with the others & into the saddle bag.