Before I give my suggestion, I wanna be sure you understand that only the top voice has to be trilled. THe thumb only plays a single note. This may be obvious to you, but just making sure.MENTAL STUFF1. Don't make the mistake of playing every note in that line with a sF. At MM 29 - 30 you can see that only the B#, C#, and the B have sF, not the downbeat. Why is this important? Because right from the start, we've given ourselves permission to play the trill at a dynamic other than FF. 2. Try thinking of MM 29-30 like this: Measure 29 make it a 5/4 bar, measure 30 make it a 3/4 bar. This will help you follow through with my first suggestion, which was to accent only the notes that Beethoven says to accent. He was no dummy. PHYSICAL STUFF3. To practice the trill, (let's just take the A# at measure 30), you must first realize that your thumb doesn't need to hold down it's note. Just play it, and quickly release it because you will catch it in the pedal. Pretend that it's a "hot" key, and that you will burn yourslef if you hold it.4. And lastly, how will you move your arm and wrist? I'll tell you. Have you ever used a manual pencil sharpener? Imagine yourslef standing in front of one, turning the handle on the side. See how your arm moves in a sort of circle, especially from your elbow? Now do it slowly, only twice. That's the motion you need for the A# trill and the B at measure 30. One arm circle for each note. You need the "small" notes of the trill to "ride" on the wave you are creating with your arm. It's not Bach, so for now be less concerned with articulation of each and every note, and be more concerned with creating the right effect. Also, it's perfectly OK to give a little more time to the A# (trill), but just make sure there is a difference in dynamic.Hope this helps.Robert Henryhttps://www.roberthenry.org