Our slope is around 25% if not more, it is darn difficult to walk, when mowing I slid off it all of the time. With switchback paths you could manage it. I would walk rocks up the hill, two steps up one step back to get stabilized for the next step.
I used to hike the grand canyon, the path without switch backs you could get down to the bottom fast, but climbing out you always walked the switchback path, a whole lot easier to go up that sort of gentle slope, took a lot longer, many more steps but easier.
Now deadheading, hummmmmmmmmmmmmmm. have not done it yet. I am going to be better at it, now that we are getting bee hives. Keep those blooms going. It seems the plants keep blooming all summer without working to much on them. Deadheading will get a lot more blooms. I treat the yard like the pond, work on it off and on, but it does not run my life. Now that I have found out I react to black eyed susans i.e. horribly, I need to be careful what my arms touch. Horrible dermatitis.
I love my bog, it keeps the pond in great shape with minimal work from me, that was my whole plan. I could ignore it all summer and the pond would do fine.
Digging a pond on the slope takes some work. The down slope side of the bog has a 8 or so foot berm, the upslope side of the pond needed to be dug down 3-4 feet to keep the down slope berm manageable. Get a laser level, sure helps. The stream was a pita to dig on the slope. I can walk the stream easy, if you head up the slope straight up, it is still hard to walk. Everything was a pita to dig on a slope, but sure did learn as I went. All of my other ponds on flat land. I figured out, after done, dig a flat entry for the tractor, makes it easier to work the slope.
I will post some winter stuff later.