merdena, yes! I say this from my own experience. In other words, 'if I could do it, anyone can.' I had two advantages. I worked in a hardware store and I did 18 hours of "irrigation school". The most important thing I learned in school was to identify and name correctly the many and various fittings. My first investment was in a can each of cleaner and glue, some pipe and fittings and a hacksaw. My first successful project was extending the water supply to our washing machine. It had to be removable to leave the original fixture intact when we left the apartment. PVC is a particular joy to work with because if you make a mistake, you can use the hacksaw to get back to the drawing board. I practised aligning fittings (without glue) to make piping go where I wanted. Then I would glue the project, test it and cover it up. Two habits I formed were to always use colored glue so that I could spot a joint that was not glued and to always use teflon tape on threaded fittings. Hardware stores have these free booklets which will walk you through the project from beginning to end. You yurself will not be able to resist getting into the act; there are so many spinoffs! Like making PVC furniture, plant supports, lightweight shelving and (clothing) racks etc. etc.

The worst beds I have to mow around are ones with multiple and rather exaggerated curves...like choppy waves along the lawn. It's the multiple direction changes that slow mowing down and get irritating. The tighter the curve (open or closed) or the tighter the angle, the worse it becomes. Gradual curves, wide open angles or straight lines don't make much difference to me after that, for edging or mowing. Checking on equipment type & turning radius is a good idea. Some riding mowers are big pigs that don't allow a close approach from certain directions. For what it's worth.

As one would expect, I would tone down the in-and-out swooping bedline effect: "S"-curves OK, but lines reminiscent of Hindu-looking "D"-cups are out. Not suggesting this is a perfect solution as I don't know what some of the things in your drawing are. It's just the direction I would go. I didn't notice your mention about the patio so am adding a comment about that... By keeping the absolute rectangular arrangement of step (I presume that's a step dividing and there are two levels to the patio ...?) the upper patio is seriously cutting into the lower patio space. I think they could both be more usable if you make the transition with a diagonal line, like a facet of octagon. Maybe it would cause you to explore the bed shape at the lower right corner of the patio for other possibilities. You'll want to complete the patio hardscape plan 100% and be happy with it before moving on with planting plan.

Set a date and invite some people to either come to dinner, or for the weekend. Works every time in getting me to work on, or finish a product. I do end up working myself to death, but it feels so good to get it done. And we recently decided to think about selling. A realtor friend called and asked to show our home. You would not believe what I got done in just 4 short days before realtor came to check the house out. And then more done in the week before her clients came to take a look!!! That was two weeks ago. Now I have company coming on Monday night...just for the night. And then we are throwing a Labor Day weekend cookout on Friday night. I will be working on a few projects this weekend. :)