I went on a hair extension course at the weekend and trained in micro/nano ring, la/hollywood weave and tape. We were taught to leave a combs width in between sections, as you do around the hairline, when starting a new row. We were all really surprised as we've always seen it done back to back but she said the reason behind it was when you go to do a refit your not picking up the same hair again so it gives your hair a rest which makes sense but I'm not entirely convinced this is the correct method for a full head as surely you won't fit many in?! Opinions...