Sending e-mails gives me anxiety too. I e-mailed michaelson when he was first enabling tipping, and I just made it really brief and straight forward like below. If it makes it easier, use this as a template, so you don't have to agonize over what to write. And keep in mind: you're not the only one doing this, the staff has already said its fine, and michaelson will be happy to do it.
If you can't do it thats okay too, but I thought I'd offer this just in case it makes it easier for you.
"Hi Michaelson,
Could you please enable tipping for my comic, [comic name here], so I can be part of the tipping event? [comic link]
Thank you!
Orioniszeta"