Hörnli hut for first ever hike

So I’m goin to Switzerland in July for 12 nights 4 nights in Zermatt, 4 nights in Wedgen, and 4 nights in Appenzell and I have multiple hikes planned, Schwarzsee-hornli hut will be my first ever hike. I am also doing 5 lakes trail, Oschinensee, Schynige Platte, Schafler ridge etc, I’m 18 and live in Florida and I’ve never really been in elevation before or just hiking in general and I’m wondering if all these hikes would be unrealistic. I’m skinny and athletic and have pretty decent cardio because I played baseball and basketball. Also wondering if having a hike or some type of thing planned each day is too much because I’m pretty much hiking every day besides the ones I check in and out of the air bnbs. Any tips help even if it is just hiking in general.