When are you going ?
If needed/convenient, I'll be pleased to escort you ...
Should that not happen, I'd suggest it will depend on the time of day. The main road (Queensferry Rd) runs from Learmonth straight out to .... go on - have a guess
- well, it goes to and then becomes the approach road dual carriageway to the FRB. It's a busy 4 lane road most of the way but used by lots of bikes and the surface isn't too bad. There are no cyclists allowed on the main dual carriageway soon after Cramond Brig.
Once you get to Cramond Brig, keep in the nearside lane and take the sliproad; left at the Y-junction then on for a further 4-5km before R ................
Och, just have a look here !
http://www.bikemap.net/route/817346
The main bit about this route is that it avoids the NCN1 way - which is terrible - and keeps most of your 'altitude', so you don't have to do too much up-and-down
.
Do have a look and ask any questions you may have. From Barnton onwards is a regular route by many commuters and others on here, so there may/will be lots of variations !
If you want a quieter route to Barnton, that too can be arranged
.