Well, I'm a bit seasoned after months of giving up public transport, relying only on the bike. I can do my comfort routes (work, friends homes, local shops) entirely on the road, even at peak times.
But if there had not been, to start with, a way to reach my destinations without mixing with motorized traffic ( cycle lanes, parks, the odd pavement) I would surely not have started to commute by bike, it would have been to scary for me as a newbie then.
Now, I see sometimes the ones that have just started using my route: they take the pavement along the busy stretch, while I am normally on the road.
We all have to start somehow!