Hey I can't do a lot of things perfectly yet...for example, the clipshift, but i practice and practice everyday and I don't plan on giving up. Same goes with flourishing. I have the trilogy too and I've just taken the flourishes step by step.
Here's my advice on getting better at trilogy flourishes. Just watch ONE of the flourishes, maybe one of the more simpler ones like molecule 4 or something. Watch the explanation, if you don't understand something, watch it again. Once you got the basic moves, practice it for a couple minutes to memorize the moves. You should dedicate a whole day to this one flourish. Just practice it whenever you can. The next day, you move on to another flourish and get the moves down. Dedicate that day for that flourish but also the flourish you started with (in this case the molecule 4). So practice both flourishes on that day. IDK if this will work for you, but it helped me a lot; but it takes a lot of determination and dedication.