I just finished a bargello recently and had a great time piecing it together. There actually are quite a few tips that I can pass along.
1. do a small one first, like a table runner. It lets you get the feel of how the pattern works.
2. you must be very organized.
3. when you get your strips all sewn together (I had 8 stripsets to make....it took a long time) cut a strip map....one long piece with a square of all different fabrics and number each fabric....it will be your goto when you have problems...I pinned mine on the wall right above the sewing machine
4. when it came time to cut the strips to be sewn vertically I only cut a few at a time, it was less confusing than cutting them all and then trying to keep them all straight and in the right order
5. press all seams as per directions....it will help greatly
6. if you have questions, please come here and ask....sometimes it's so much easier than trying to figure it all out by yourself.
Here is the post of mine in progress with pics
http://www.quiltingboard.com/picture...s-t152707.html