Trills

What instrument are you talking about? If piano, your fingers should do the work. In any case (and this is important to remember) the main concern isn't whether it's acceptable to "cheat", but whether you're hurting yourself. If we're talking piano, that's quite possible in this case.

an exercise (or rather, anOTHER exercise) you can try is "rythmic trills".

that is, you start by practicing the movement using a long-short, long-short rythme.

then you invert to short-long, short-long,

then it's long-short-short, long-short-short

and invert to short-short-long, short-short-long

you gradually work your way up to dozens of short notes before or after a long note.

The point of the exercise is to make long and short notes of EVEN dynamic.

As well as removing the emphasis from one finger or the other.

The exercise should be done using 2-3, 3-4 and yes, even 4-5.

by the way, you MUST alternate sets of exercises between the long note being the first note and the short note being the first note. This way you avoid getting into any bad habits of accentuating one finger's notes over the other's.

I'm having a lot of trouble playing the trill at the beginning of Jenamy... with the left hand accompaniment at the very high speeds. I don't know whether to play a normal trill (which isn't my interpretation) or to practice so much more just to barely be able to pull off a free trill at such a high speed. I practice slowly and work my way to a faster speed... but I'm still having trouble. I need help with this..