Hi Gary,
Myself and fishing buddies go to Assynt annually. Usually based within 30mins drive or so of Lochinver and its pie shop, which you have to visit. The hardware/chandlery in Lochinver is where we got permits and wee map last time.
Loch Assynt *is* huge. But we will always fish it for a couple of hours in between longer expeditions to hill lochs. the margins are trout friendly, mostly…some banks areas are repeatedly productive, others seemingly fish-free at times, so if they day feels fishy, but the trout aren’t showing, move on. if it’s been raining, look out for burn mouths where they spill into the loch, stating the obvious! And worth exploring the eastern end where there are a couple of larger burns coming in. I’ve seen some lovely long wind lanes with olives in the foam lanes blowing along the loch, at times. And other days where the wind will blow you over 😀
The choice is bewildering, so Andy’s earlier advice is good. Have a wander.
Flies… our proven, predictable piscatorial pick for dries is a Sedgemerger- a palmered body, deer hair sedge with green/olive dubbed body. Any low profile sedge in sizes 12-16 is worth a swim.
Cheers
Iain