What is the best way to stick labels on a glass bottle?

I have a few thousand glass bottles that I need labels. I have printed the labels and now need to stick them on the bottles. After many attempts the labels go on smoothly, but you can see a few ripples and air bubbles. How can I put on the labels without having these ripples and air bubble problem? It is a bit strange because the glue on the labels is very strong and I have used a hairdryer to heat the glue to make it stick better to the bottle.

Any suggestions?? Thanks in advance!