Don't try to see everything in one trip. Pick out a few places important to you and really do that area for a few days.

If you rent a car do get an automatic (From flatland and even though I have driven a standard for 40 years, hills give me the willies) and fill up often. Don't plan long trips on Sundays!

Definitely stay in B&Bs. Besides meeting interesting people, we asked for oatmeal at the B&Bs, ordering it the night before (as many begin cooking it the night before) It was always perfectly cooked steel-cut oats in generous portions and as we also requested not getting the heavy fried breakfasts, we got almost a quarter off our bill, totally unexpected, but true every B&B we stayed in.

Take your time and expect the unexpected. Our two favorite finds were Castle Doune where Monty Python was filmed (had 2 teens with us) which was just going to be one more castle after going to Sterling, ended up spending several hours there just watching them! and the little stone circle at Lochbuie on Mull, mystical place and only one other couple there the hour or so we were there and I only happened to find it on one map!

Food was incredible everywhere we went.

Enjoy your trip!