Aright so here is my advice on order of assembly. 1. Inventory and match paired armor piece halves. 2. Trim the excess flashing (waste plastic) on all pieces. Don’t worry about return edge thickness yet; just remove the excess beyond the return edges. 3. Begin trimming pieces for fitment, starting with Biceps (largely hidden so trimming errors can be masked). Also when first trimming start on the rear-facing ends of the pieces so any mistakes are on your back. 4. Forearms (nice small pieces) 5. Shins (left shin first since knee plate can help mask possible seam/joining issues). Be sure to size for fitment only after you have your boots to ensure proper sizing. 6. Thighs (right thigh first since ammo back can help mask possible seam/joining issues) 7. Posterior, kidney, and ab 8. Back, chest, and shoulder bells 9. Helmet (largely considered the most difficult, and also prominent, piece)