welcome to the club.
This project takes patience. It can be confusing at times teetering from the cut list to the materials list. Just make sure you know the difference between the two. Also, if you are brand new to this and don’t own a lot of equipment, you might want to consider having your local home improvement store make the cuts for you to your dimensions. Please note that they don’t make precision cuts for the bartop, nor can they cut out the area for the beer gutter.
When I did my project I wrote the numbers and letters of each piece on them, so that I would not get confused. I also use a compressor with both an air framing nailer and brad nailer. It is worth the extra expense to either rent one or borrow one (to get the professional look, you have to use the same tools).
Last hint. Keep this website close of the bars other users have done. It helps when you get stuck. Good luck and have fun!