They're not really hard. Like everyone else said, all you need is timing.
I don't remember the second trial ones (the ones with the slog right after them, in the door with the sligs), but I know that to get through the fourth trial ones (the rightmost door on the upper level) you have to roll in from the previous screen without stopping, you should miss the ball and catch onto the ledge. Then, wait until the ball you just passed is at its highest point, climb up, and then crouch immediately. Roll over to the edge of that ledge, wait until the ball is at its highest point, very quickly stand up, jump, and immediately sit down. You can also roll directly off the ledges, but I believe on the way back you can fall off that way.
/long difficult explanation
So basically, it all comes down to quick reactions.
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My Abe's Oddysee walkthrough
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