I was up there a few weeks ago for three nights, I mainly stuck to the southern upland way, it was hot, very hot but it was nice to cool off in the river at the end of each day, I found plenty of places to put the bivvy up for the night away from the main path and next to the river, there's plenty of burns to get water from along the way and the midges never bother me (I guess im just lucky ) I parked up at glentrool visitors centre (got a fortnight parking pass from the commissions office in Newton Stuart £12 as I went back up later for a few more days ). I didn't do the lochs as my mate is a midge attraction so just stuck to the river where there was a lot less of them.