Eh... relatively easy?
As far as Konohana goes, in your first few seasons or so you might be struggling to make ends meet while expanding your farm, but things get much easier after you unlock some of the heavy-hitters of the crops, mainly watermelons and pineapples in summer, and blue roses in winter. I was able to start growing blue roses in my second year, and pineapples and watermelons in my third, but some might have been able to do it sooner.
At first it seemed like they really nerfed sweet potatoes this time around, and in terms crop selling prices they did; out of all the fall crops (flowers included), only spinach will net you less of a profit in a season, thanks to the insane price for one bag of seeds and the relatively low shipping price of the sweet potato itself. However, that seed price works in your favor after you get the seed maker and are able to start shipping the seeds themselves; you can make a profit of a little less than 24k off of the initial investment of one bag of seeds, and that's without the aid of fertilizer.
Regardless of which town you live in, you can also take advantage of the okayu/toast trick. This involves buying up as much rice or wheat flour as you can, and then cooking it into cooked rice (if you bought rice) or bread (if you bought wheat flour), and then turning that into okayu (rice) or toast (flour), then selling that; it works out so that you get about a 70g profit off of each item, which doesn't seem like a whole lot, but multiply that by a few 99-stacks of items... (sito-jaxa taught me that one~)
So, yeah, change that from "relatively easy" to "pretty damn easy if you know what you're doing."