Hi Chris, welcome to the forum and congratulations on starting treatment. Mavyret is an excellent medication with very mild side effects, you shouldn't be scared at all. You should also be very optimistic about your chances of getting rid of this terrible virus as Mavyret delivers very high cure rates.
I believe that it's totally fine to cut the pill into 2 halves on a clean surface if you're having trouble with its size.
Here are some recommendations for you to follow during treatment :
1. Drink plenty of water as it really helps eliminate/minimize any potential side effects.
2. Take your medication at the same time every day just before or with food, as it helps with the medication absorption.
3. Try to get enough rest and eat healthy (plenty of fruits and vegetables). There are no foods to be avoided when taking Mavyret.
4. If you're currently taking other medications as well, be careful they do not interact with Mavyret. The following webpage will tell you about any potential medication interactions www.hep-druginteractions.org/checker
Additionally, the 'During Treatment' section of the FAQs page fixhepc.com/frequently-asked-questions.html has some more detailed information.
Best of luck with your treatment Chris and keep us updated on your progress.