The first few trips are always the hardest.
My instructor told me that most people make a right mess of the first five hours ( you know the kind of errors, tongue tied or sprouting

that makes no sense, getting lost while doing the teach, or missing out valuable bits of the exercise/doing it in the wrong order), and then it all suddenly comes together.
And it did. I wondered at the begining whether I would be able to complete the course, but after the initail five hours it all started to fall in to place. I'm not saying I stopped making mistakes, but it suddenly seemed achievable.
Keep at it, your going to be qualified for the all important summer season.