I rode bikes until mine was stolen from school when I was 13.
20 years later, I bought a lightweight steel racing bike from Harry Halls in Manchester (before the IRA bombed them into new premises) and wheeled it over to nearby Victoria station to bring it home. I emerged with it from Hebden Bridge station, mounted it for the 1 km ride home and immediately discovered that ...
- For me, riding was like swimming - once learned, never forgotten! I took to it again within 50 metres - no wobbles, no swerving, no problems.
- That bike was way better than any I had ever ridden before. I was used to childhood bikes weighing 50% more, and with brakes and gears that didn't work as well.
So, my answer is that you should have no problems as long as you take a few minutes somewhere safe to get the hang of your bike. An empty car park perhaps? It will take a while to get the saddle and bars set up just right for you so do that while you are getting used to the bike.
Have fun!
PS What I forgot to mention was that though riding the bike was easy, I found dealing with the traffic much more of a problem! Roads had been much quieter in the late-1960s and I was nervous on busy roads for the first year or so after starting riding again. (I still don't like busy roads, but I can cope if I have to.)