Making Plans with a Friend

I'm autistic and I want to see [The Friend] but I never know how to start, and when I do, I either over-plan or cancel. What I'd like to do: [Activity]. What makes hanging out hard for me: [What Makes It Hard]. Help me: 1) write the first text — casual, short, with a specific day and time so they can just say yes or no, 2) give me two follow-ups: one if they say yes, one if they say 'maybe, let me check', 3) estimate the energy cost of the plan and suggest one change that lowers it (shorter, quieter, an end time built in), 4) give me a script to leave early that sounds normal, not like an apology, 5) give me a text to reschedule if I have to cancel that keeps the door open. Don't tell me friendship takes effort. I know. Keep everything sounding like a real person texting, not a template.