Start in the middle and work out. I was told to do it in quarters, but being that you have a wallhanging there shouldn't be a problem. Tell yourself that you can do it. Use comfortable stitches so if you have to rip out the stitches it will be easy for you to do so. Remember, we all have to rip out stiches for one reason or another, even the great quilters. Also to remember to breath and have fun. You can do it!