I also finished the back of Matt's Sampler Cardigan and decided I needed to tackle the pockets (before it was seamed together and much more cumbersome).
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I'm basically doing an afterthought pocket. Using the same technique as an afterthought heel... but no shaping. I'm also doing a purl stitch on the sides to help it lay flat. I'm thrilled with how it turned out.
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This pattern screams for an inserted pocket, as it's easily hidden between the samples stitch sections. I think Matt will appreciate having pockets, and for some reason I think it'll make it more "manly" (I have absolutely no idea why).
Anyway, after the pockets, I'll seam up the shoulder seams and do the front buttonbands (before I attach the sleeves... again, it will be less cumbersome).
Rosie: I'm actually not doing inserted sleeves, but the dropped shoulder style as the pattern is written. For my next one (as I look like krap in dropped shoulder styles), I'll do inserted sleeves... and since I work flat, it's not that hard to still do top down. I just pick up my stitches, work even for the length of the insert before I start my decreases (actually I usually work farther than that, as I have heavy upper arms and I like to start decreasing closer to the elbow). Then I just seam the inserted area. However, if you want to attach the insert as you go, check out Cabin Fever's Braids Cardigan, they have directions to do that.
As far as side pockets, I've never done them in knitting. I think the Vogue Knitting book has directions for it. I don't think it'll be difficult, but you might have a little extra seaming to do.
Okay, off to procrastinate on blocking the Lace Crochet Shawl...