Applying for beard - questions

I’m starting my minox beard tomorrow and had some questions

I’ll be using 5% liquid topical minoxidil

Seems silly to ask but just want to be sure, you only apply it exactly where you want beard growth right?

To be more specific, if I have an idea of where the upper end of my cheek line should be, do I apply the minoxidil only up that point on my face? Do you have to be careful to not even go slightly above that? I’m not going to be applying this to my forehead lmao but on my Cheeks/sides of my face I’m wondering what level of accuracy is important for applying

Also, does everyone pretty much do once a day application? Are mornings best?

Thanks

Edit: forgot to ask in OP. I’m planning on maintaining a little bit of facial hair. I’ve read both that having existing facial hair is good and bad for applying topical minoxidil. Is it better to maintain a clean shave for months/years while I’m using this. Can I just let my beard grow? Or trim it? What’s best