The first step is to sew on the sleeves. Fold the sleeve in half length wise, then fold the tunic piece in half width wise. Match up the fold on the sleeve to the fold on the tunic (this is your shoulder). Pin. Do the same thing on the other side with the other sleeve. Open it up and sew the seam.
Fold the tunic in half again and pin the side seams and the seam underneath the sleeves. Start at the bottom and sew up the side and the underside of the sleeve.
After I did this I tried it on. I need to soften the line from the waist to the edge of the skirt. It doesn't fall right. I used too sharp a curve. Everything else is good, except the neckline. I still haven't figured out what I'm doing with that. It needs to be tightened up. I'm going to pin it and see what it looks like. I have beautiful trim so I can cover anything needed.
Here is the material I'm using. It is a wool blend.