Everybody hates drawing hands.
Lies! Some people love drawing hands! Admittedly, those people are super-weird. I've known several people who just fill up notebooks full of hands in different poses - once you start digging in, it's basically the whole "face" thing again where you need to relearn everything about proportions to make it look good. But hands are still better than feet...
Also, this next part may just me talking out of my ass, but...
For the chins and noses, when doing character designs remember that the most important thing is
consistency - it can look pretty damn weird and out of proportion, but if you have three images where it's in different poses but still following the same rules, no one will think so because we acclimate quickly. It turns out in real life most people have facial features that are pretty weird and out of proportion, especially in regards to jawlines! And you'll want to actually exaggerate most of those in practice anyway so it's easier to distinguish your characters from one another at a glance - if the change is so subtle that you can't detect it from a silhouette of the face, you're probably better making it a bit more obvious.
This... isn't something many manga-style and american comics book artists do all that well. Often intentionally, since it makes the workload easier and thus cheaper to insure every artist can draw one face in multiple different ways and then just use that face for every character - audiences tend to pick up inconstancies between angles here much, much more quickly than inconsistencies between clothing or hair. But this is for industrial environments, where output is more important than variety, and in high quality manga and anime that focuses on good artwork you will almost always see this principle become important again. When you get to departments or individuals with big budgets or lots of time who really value the artwork, you can see it come out again very quickly, because most artists recognize the value of having an identifying silhouette, not just for the body but for every piece of the body - the face, the clothes, the hair, the hips, even the hands (depending on how detailed you want to go). Not all of those details need to be visible in every rendition of the character, of course, but it's important they exist.
For example, take Monster (art by Naoki Urasawa, who is amazing as he both wrote the series, which is quite good, AND did all the designs and most of the artwork, and clearly has no concept of "economy of effort", heh):
That's some beautiful variety right there - you could identify every one of these characters just from their face outline. Hell, you could identify most of them simply from their nose OR their jawline OR their eyes, And that's the sort of thing you should be trying to aim for - don't fall into the trap of thinking "faces need to look
just so".
Just because faces are
generally flatter than you might expect doesn't mean you have to make them
boring.
Although as you get better you'll realize there are actually ways to give characters exactly identical features and still, somehow, make them look like completely different people. As an example, see any artist who handles the "mind swap" thing well, because some of the work I've seen done there is incredible, where you can literally see, visually, just in the way the character holds their face muscles and neck and shoulder the difference between the characters. But that is way beyond the league of my ability to encourage or even identify how the hell they do it, heh.