I haven’t done much garment sewing (primarily a quilter), but always wanted to make a blazer. I made a muslin first and was able to follow this pattern, it’s extremely well written and even includes preshrinking instructions for wool/interfacing! I went slow and got some help with fitting from someone who knew what they were doing, but was able to make an excellent finished product! Note the fabric requirements are conservative. Consider adding a quarter yard to give yourself a little breathing space.