Now that the neckline and fronts are finished (you DID take a minute to feel smug about that, didn't you?), the only big step left is to mount the sleeves on your Permission Denied. Or, if you aren't done finishing the fronts and neckline, that's fine, too; you can save them for last and hit the sleeves now.
But of course, first things first: Ruby is fabulous. Just saying.
So, sleeves. If everything is going according to plan, you should have armholes that look something like this; open slots at the sides of the body with closed shoulder seams:
Find the center top of one of your sleeves, where it will meet up with the shoulder seam, and mark it. Stick the sleeve into the slot from the outside, with the little armpit flange (the mitered part of the sleeve top facing) down toward the armpit, and the center of the top up by the shoulder seam. Pin the center top of your sleeve to the shoulder seam with a safety pin or a separating stitch marker.
Now thread up a tapestry needle with a single strand of yarn in any color (it should disappear if you do this right - mine's purple), about three times the length of your sleeve top circumference (mine was around two yards long). Leave a six-inch tail, and beginning at the armpit, stitch back and forth from the body to the sleeve. Your sewing should land in the first column of knitting adjacent to the securing stitches, and under both legs of every single knitted sleeve top stitch at the base of the facing rounds. Make long loose stitches, like the lacing on a corset. Every inch or so, you'll pull your sewing yarn snug, "lacing" the sleeve into the armhole and watching with delight as the working strand disappears.
As you know from sewing knitted columns to knitted rows in the past, you'll need to compensate for their differing ratios. At this gauge, I typically skip every 4th or 5th row of the body, while hitting every single stitch of the sleeve top. Your mileage may vary, of course, so be patient and unafraid to back up and start over if you have to until you get it right. The second sleeve will be much easier (for once!).
You'll know you've got it if everything is matching up as predicted when you get up to the shoulder seam/sleeve center juncture. Take self-congratulatory photos, if so. Then continue the rest of the way around the armhole until you meet your starting yarn tail. I like to tie the tails in an overhand knot, then pull them through to the inside and trim their ends to about 1". Now do your second sleeve while you still remember what the stitching ratio was.
You should now have sleeves in armholes that look perfectly respectable from the outside, and a little bit nightmare-y on the inside. Resist the urge to panic and get out some pins, a sharp hand-sewing needle and thread. A bit of beeswax on your thread is a good idea - you don't need any unwanted knots making things difficult for you. Smooth and pin your beautiful knitted facing down over the cut edge of the armhole slot. This is the last time that messy cut edge will be heard from, so thank it for its service, and bid it adieu. Thread up your sewing needle with a single strand of thread and knot its end. Start at the armpit again, and sew invisibly with a felling stitch all the way around the facing. Catch only the surface of the floats on the body side of this seam, and one leg of your bind-off stitches on the facing side. Keep your sewing stitches firm enough to be invisible, but not so tight they pull the knitting in.
Once you get all the way around, secure your sewing thread and cut it. This is the magic part of the sleeve top facing. It's almost impossible to figure out from just seeing a finished one. Now that you have done it, you know its secrets! Feel smarter? You are. Finish your second sleeve and congratulate yourself with a well-deserved treat of some sort.
If you're moving on to finish your fronts and neckline, now's the time for that. If you already did that, the only thing left is closures, if you want them, and ribbons/trim if you are a maniac.
I skipped the ribbons and trim this time (well, not buying them, but applying them) in a bizarre fit of restraint. I made some swell contrasting button loops and ran my buttons two by two.
And that's all she wrote, my friends. Next time I'll model the big reveal. Providing I can find somebody else to hold the camera for me, of course. Ruby has yet to volunteer, but the camera is bigger than she is.