Jaci - I pick her up and cradle her. I've never been able to put her on my shoulder...even as a newborn, she just arched her back and looked around.
If she fights me, I count to 5 to see if she'll settle down, and if she doesn't I put her down. She usually keeps right on hollering, so I count again to see if she'll calm herself (yeah right!) and pick her back up. She fights me most of the time so we just keep on doing it until she loses steam. If she stops as soon as I pick her up, I put her right back down.
I know to stop and leave once she's in the crib and not screaming anymore. Sometimes she's still moaning or whining and I'll leave her to it. I've had a hard time leaving the room lately with sep anx, so I usually end up standing in the door where she can see me.
PU/PD can be confusing at this age, and it can really suck. I've only done it maybe 5-10 times with her, and the longest it's lasted is 20 min. It definitely does work, though!