Look around for local driving schools that do lessons on driving a manual transmission. Book a few lessons and enjoy having an instructor with you as you drive the car guilt free. Its less rushed than using a test drive car to learn and less pressure to commit to it afterwards. I think its best to have some competency with a stick before test driving a car for purchase because not all cars are equal when it comes to how good the clutch or shifter are and you will be in a better position to evaluate that if you know the basics on how to operate them.
Here in Toronto I used a driving school called Shifters that exclusively taught how to drive a manual. After that I had the confidence to properly evaluate a car on a test drive. I know now I'd prefer driving a manual in all cases except if your commute to work is long and full of heavy traffic.