I don't see what's so wrong with along for more time if you're actively using that time to get more comfortable? I mean, why not get on the firest possible footing before moving forward... that could spare everyone's feelings versus if you move forward because it's supposed to be time to but aren't really ready and end up having to ask him and some new flame to break it off. On the other hand if you don't think you can get any more ready than you are now, you probably do just need to take the plunge.
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.