There is a difference between the pitch and the chip. The pitch is a farther shot. For the pitch, I take my normal stance with maybe a little more on my right side. I keep my body very quiet. Square the club face with the ball slightly behind center to ensure a descending blow and prevent sculling. Bring the club back and swing keeping the left arm as my central thought. I try to keep my left shoulder from opening too much. A little wrist hinge on the way back but I hang on to the club with my left hand (don't release my wrists) and follow thru about waist high. This will produce a lower flight. I use a 60* or 64* to compensate. Fly it to the hole, because you won't get a lot of run. I recommend staying away from he lob unless you absolutely have to. It's better to run it a little past and trust your putter than to chunk a flop shot. I can flop, but It's takes a good lie and the most oncentation of any shot I do. I'm not Phil.
Chipping is from just off the green when it's too risky to putt. When you can, choose the Texas Wedge (ie putter) if you can. When you can't, grab a PW or 9i to chip with. I try to chip with the same club if I can. Get the feel down with one club. When you feel like you can finally chip, you can take different clubs to chip with. I chip quite a bit like I putt, except I have more weight on my left side, play the ball a little back of center and have a forward lean with my hands. Bring the club back without hinging your wrists (too much) and accelerate thru the chip without releasing your wrists. Follow thru to the target. The worse the lie, the more you'll have to nip or dig out the ball. For a perfect lie, try your normal putt, making sure you land the ball on the green if at all possible for a more consistent ball release. Take a look at the Jim Venetos vids on chipping. He obviuosly exaggerates the weight on the left side, but that is his method. If you don't feel comfortable doing this, just back off the weight shift and closure a bit. The rest of the technique is sound. I can literraly chip with my eyes closed and hit it every time.
For fairway bunkers, I typically take an extra club or two for the shot. From 100yds I usually hit a PW, so I'll take a 9i. Take a solid stance and hit a 3/4 shot keeping the head absolutely still and the lower body quiet. I get a consistent strike of the ball. Unless the front edge of the bunker is too high, I typically hit the green witrh a fair bit of spin. I've often thought of doing that shot from the fairway and I'd probably shoot pretty well. :)
Plus, I only use tour quality balls such as a Pro V1 etc. I use the Srixon Z-Star. This will spin when it hits the green. If you play a Top Flite, plan on the shots feeling stiff off the club face and not stopping very well on the greens. If you don't feel like hitting and losing $4 golf balls all the time, do what I do sometimes for practice rounds. I cheat like a MFer. I hit a rock off the tee (Top Flite, Pinnacle etc). I find these all over the course. I then replace the tee shot with a Srixon and play the remainder ofthe hole. If I happen to lose the drive, I don't care because I have a garage full of replacements. When I play in league, I of course play the Srixon throughout.
PS, practice, practice, practice the shots until all you really think about is where to land the ball. The mechanics are second nature.
My 2 cents.