We are not exactly romantics, but we actually didn't want news of our engagement (a very egalitarian thing where we mutually decided it was time to get married, no proposal) to spread until we'd set a firm date. We told our parents, siblings, and priest so we could ask them what dates were absolute nos, then firmed up the date with the priest, then told everyone.
It worked for us, but it's far from the only or the right way to do things (I don't even think there is one).
Some couples wait 10 years before their engagement, some elope without ever announcing it, some are engaged within a week of meeting and wait 10 years to get married. Most of us are somewhere in the middle. It works, or doesn't work, for reasons generally having little to do with the timeline. Be secure in your decision not to make a decision yet!
For what it's worth, I think the average engagement is something like 18 months.