Good news! Believe it or not, you are more than coordinated enough to load film reels in a changing bag and enough rolls have been processed using Paterson reels to establish out that they are of good design. Clean your reels, make sure the ball bearings are free and move nicely, practice in the daylight a few times. I find that high humidity makes it more difficult if that is of any value to you.
Good luck, you will work it out,