Hello Peter and welcome to the site.
The first stage of the WHW is well marked, as is all of it. You probably won't be on your own as this stage is near town and many people walk the area around Milngavie with dogs etc. The WHW being so popular you don't go far without finding someone to pass the time of day with.
I did the walk last year over 7 days, loved it and doing it again next year
Happy walking