I've made a couple of bargellos although mine have been large wall hangings -king size, WOW! One is my avatar. My best advice is Label, label, label your strip sets, rows, your pattern- anything that keeps you organized. As you attach your rows sew in opposite directions: if you attach row 1to row 2 by sewing from top to bottom, sew row 3 to row2 by sewing from bottom to top. Also do this as you sew your strip sets. Be careful not to stretch your strips and rows as you work with them. Whatever row you start with label it top left, right or center depending how your pattern is set up so you are always sure where you are in your construction. They are not hard, but you will enjoy the process more if you stay organized and work steady, but don't rush. Oh and don't work on it if your tired or distracted. That's how I came to redo rows 11-21
Enjoy we'll be looking for pictures!