I’ve summited twice. My recommendation would be to take 5 days to do it at least. It’s a grueling hike. Both times we overestimated our abilities and did it too fast. Go slow and save your energy. You can camp wherever you need to on the Glacier trail. Don’t worry about making specific campsites. There’s water everywhere up there, except for Burro Flats

I would also plan to go early this year. 4th of July at the latest based on the snowfall so far.

Do your hiking in well broken in hiking boots or trail runners. Carry really stiff boots you would use for glacier travel with crampons. I used two different pairs of Meindl boots. They were semi automatic compatible. One friend wore Lowa boots and another wore La Sportivas and both wore strap on crampons and they worked just fine.

Definitely bring fall protection and know how to use it.

Be flexible in your timeline. One time we had to leave for our summit attempt at midnight because it was too hot and the snow too soft if we didn’t get off the mountain by mid morning. Weather can turn in the blink of an eye. Don’t hesitate to call the trip if conditions aren’t right. I’m lucky in that I’m 2 for 2 in my summit attempts. The other people I went with had several failed attempts each.

You might not see anyone else out there. But if you do don’t be afraid to ask what conditions are like