I would like to inquire about forehead and glabellar botox!

I think I have wrinkles between my eyebrows and on my forehead, so I'm thinking of getting botox before they get any worse!

I was wondering if it would be effective to get it on the forehead and between the eyebrows at the same time, or if it would be too uncomfortable to open my eyes if I got it on both at once.

I'm curious if they're done simultaneously or separately with a time difference!