I am still lost with progressive slow motion

[Haddock]

I will resume here to explain what I want :

A clip that I need to be divide it in 3 sections :

First section in normal speed : 100 %
Last section in slow motion : 20 %
Middle section : starting at 100 % and going to 20 % with a bezier curve - starting slow... going on constant decreasing speed... ending slow.

I have already receive in the past some answer... but sorry I did not understood the way to encode it

Thanks in advance

[edver1]

I'm struggling also,sometimes it works from the first time and sometimes I can't get it right !
I found a short clip and to me it looks "easy" and clear : https://www.youtube.com/watch?v=cZ8JdVpx-Gs or :https://www.youtube.com/watch?v=4wKc8YW6P9M
The "time line" above is the real time ( depends on where the scrubber stands on the timeline ) and the bottom timeline shows the clip You gone change.
The first clip is without talking and I think it only makes it more understandable.
Hope it's of some value for You !

[Haddock]

Thanks, I will have a look on it. I agree with you : sometimes it works from the first time and sometimes I can't get it right !