Unfortunately I've organised quite a few funerals now.
Consider a celebrant if you think you won't be up to reading a eulogy - it can be far more upsetting than you think
If you want to do the readings yourself then practice, practice, practice, until you have it memorised as it will be easier not to get upset on the day if you know it by rote.
A funeral without any flowers can be a bit sad so consider just something for the coffin at least. They do act as a focus for conversation.
Yes to no hymns that are particularly high as your voice will crack. Consider taped music instead.
Don't have the wake at home, you'll never get rid of people. Hire a pub or a hall. Pay for first drink only, it weeds out the freeloaders. Sandwiches/crisps/ basic buffet etc is absolutely fine - people don't go to funerals to get fed, although a decent amount of nice food is always welcome.
It's ok to leave ahead of your guests as long as you've said goodbye to everyone and paid the bar tab.
Make sure you have a designated person to deal with any anticipated friction with extended family (for example). If you think your cousin is going to start bitching about the will, having someone on hand to head that shit off at the pass is super helpful.
Finally - be ready for the proper grieving to start once you don't have the funeral to focus on any more. It catches a lot of people out.