You should be okay. Do you have a handheld GPS?
Is your TM a 5 speed or a variable speed or ...?
When I 1st started to learn to LL troll I had a 5 speed 30# TM. My standard practice I did on most days was to use #2 speed with the wind and #3 speed against the wind. I had to make adjustments as wind speeds picked up. I had no idea how fast I was going.
If you are slow trolling, spider rigging, tight lining or whatever the proper name is try keeping your line fairly vertical as you s-l-o-m-l-y move along. If you vary you speed try to pay attention to the angle the line is going into the water. Then try to repeat what works.

