There are buses from Fort William and Glasgow that run through Glencoe, but if you want the bus to stop at the point where you want to access your walks, then be sure to have a quiet chat with the driver as soon as you get on the bus. Some drivers will be happy to drop you off, but others will kick up a bit of a fuss and say it's not a scheduled stop, and you can increase your chances by stating your case well in advance, rather than trying to get the bus to stop with 10 seconds notice. If the road is busy, and there are stacks of cars piled behind the bus, the driver won't stop, but if he's a genial sort of chap and you've given him lots of notice, he might be able to let the traffic pass at some point before he stops to drop you off.
Same applies in reverse at the end of your walk... only this time you won't have any chance to negotiate in advance. If the bus stops for you in the middle of nowhere, then count that as a bonus, but if it's doing 60mph and has a stack of cars behind it, just accept that it's not going to stop without causing a massive pile-up and great loss of life!
You can tell I've had to do this on many occasions, can't you? It's even more fun in a foreign language!