I was petrified about bathroom issues pre surgery too. Just try to let it go (no pun intended). There is no way of knowing how your body will react.
Not constipated or diarrhea. The first push is like a normal poop and sinks. But if I am patient and sit there, more will come out, looser, but not loose -- this is the greasier stuff that floats. If I do not allow the time for the "round two" to come out, I may regret it. I usually go out for a 4 mile walk afterwards and there have been 2-3x where I have made deals with god to allow me to get to a toilet.
I do poop as soon as I get up whereas pre DS I didn't poop until I had coffee. (I gave up coffee, d.coke, tea and all caffeine two months before surgery.) Maybe 6x since I had DS more than a year ago, I have awoken at 4am and had to poop. Not a bad pooper -- just way too early in the morning.
But everyone is different. Someone else about the same age and weight had the DS with a much longer common channel than I. I figured she would lose weight slower and never have bathroom issues. Just the opposite. She lost weight a little bit faster than I but she has had a couple of public poop accidents and so carries an extra pair of underpants.
Just remember: fatty food (which we need) gives you greasy, floating poop which can smear in the toilet. Carbs cause gas. If one or the other become a problem, adjust your diet.
The first month, even modest exertion knocked me out. I think I walked a mile 2 weeks out, then came home and slept for three hours. I never napped pre surgery but routinely napped for the first month. I can't imagine having to work until a month out.