Chopin op.53 Trilling

[eddytheone]

Hello
I've been playing this piece for some time but have never managed to get the trilling done correctly after the "walk down" in the main theme of the piece and was wondering if anyone has any tips on how to get the trill more fluid or even
The part for those unfamiliar with the piece or my failure at explaining which bit I mean is the middle bar in the following image

I must point out that I have never been taught how to play so any technique on trilling is self taught so there might be due to a fundamental silly mistake with how I am executing them

Any help whatsoever is more than welcome and thank you for your time