Hitting Google is a "!g" away -- just prepend / postpend that to your search and hit enter, you'll get Google's results (as I've noted elsewhere here: I usually try "!sp" first, as it's close to, but not quite, Google. What I noticed in my first weeks was that usually the initial results were actually very, very similar, if not identical. Since DDG has the same search syntax ("site:example.com" restricts to a domain or host, "quoted words" are searched together, (either|or) will do booleans), if you're a Google search power user, it's all familiar territory.
DDG's information and support pages tell you a lot, and the !bang search syntax is very much worth knowing about. If you want to search !so (stack overflow), the bang syntax is great: https://duckduckgo.com/bang.html
There are things DDG doesn't do, which I've also noted. Date-restricted searches and localization are two of the big ones. I don't avoid Google entirely, but it's way down my list.
I did enter into this with the mindset of intentionally taking a choice that's not Google, and that I'd have to make some compromises, but that I'd get better privacy as a result. The compromises really have been few, and I'm saying that as a long, long term Google user (since 1998) whose been increasingly disturbed by the company's direction.
In the end it's definitely a huge adjustment.