Yep, I agree with @Zoffiel. You just don't know how you're going to react to your first one so it's best to arrange a lift to and from. After that you'll know what you're capable of. I had an allergic reaction to Docetaxel and had to have Phenergan as a result. It made me so dopey & sleepy there's no way I could drive home from any of my infusions.
You're absolutely right about trying to stay in the moment and living one day at a time. There's no point in crossing bridges until you come to them. And that applies to life, not just breast cancer.
Of course it's easy to say but harder to do! I was a mess before my first chemo. Do your best and reassure yourself with knowing that you're not alone, that most everyone one here has done/is doing it, and never forget why. We're all aiming for as long and as healthy a life as we can manage. Eyes on the prize lovely. Big hug, K xox