I'd say give it a month then reassess. During that month, if you're really nervous, make sure to ride where there's no traffic and low stress so you can focus. There's a learning curve. I hadn't ridden a drop bar bike in 27 years, bought a flat bar hybrid in October and have already purchased a drop bar bike. I've had it a month and am still getting used to it. Hang in there. Changing out bars isn't like changing shoes, it take a bit of work, so I wouldn't do it or have it done casually. Just my .02 cents.