I start in the back, but I do the hairline all the way around last. I part off a section maybe 1/2 inch from my hairline all the way around. Once I've applied it throughout the other parts, I go back and do the nape/"kitchen", then the hair by my ears and my front hairline last. Before when I did my nape area first, I would have breakage in that area. I think the front is even more susceptible to damage, so I always do that last so there won't be any thinning or receding in that area.