Took a long break from Feh (2 years just about) and returned in late June. What tips/information should I know about "Your Time to Shine" game mode?

Basically the title. I see that there's limited stamina so I'm nervous to potentially waste it became I don't know what I'm doing. I read the information provided in the little help section but it didn't really give me a clear understanding.

Is there anything I should know when considering the team building? Are these particularly difficult battles? That is, should I include a newer unit that can generally handle most things like Brave Felix?

(Aside: I'm kinda scared/excited what nonsense gimmick they'll give this coming round of CYL units because Felix is heckin broken with his lone wolf extra action shenanigans. Unrelated to YTTS, but can one slap Galeforce onto B!Felix and get an additional combat action? Because that's even more nuts if so.)

Is YYTS anything like the Seer's Snare event where you get to add extra skills to units? That game mode is so awesome, and so much fun. I wish it ran every other week, haha).

Thank you for all help, tips, advice! I'm still learning the newer skills and stuff in the game. Thank God I'm an avid reader because otherwise the book-length descriptions on some of these skills and weapons would never get read, but it's still a lot of information and a lot of "Okay, so, uhhhhh, how am I supposed to math this in my head??" God bless the players like PM1 who put out helpful graphics/images breaking down some of these units because I would be utterly lost without them.

Finally, in your opinion, how does YTTS rank as a game mode compared to others? Other than I think United Warfront, it's one of the only modes I haven't played at all til now, and I think seeing where others place in in terms of their enjoyment will help me understand a bit more this news mode. Well, "new" to me; I don't know how new it actually is, haha.