[zython]

>Always do at least 1 full rehearsal with a timer, preferably two full rehearsals where the first one you do keep a timer but also have a notebook (physical) present to quickly write down adjustments you want to make.

two are still too few IMO (I'm not a native speaker but still). I like to do at least ~5, where I can get a feel for the sentences I'll pick for transitions (like some sort of theater play) so should I get stuck somewhere I know how to transition to the next talking point/topic.

>Do not use a linux machine,

eh, my experience with linux machines was mostly positive, what I can recommend though is to have the slides ready (4:3 and 16:9 aspect ratio) in the cloud as a "safety net"