How hard is it to make your own clothes?

For the past 1–2ish years I’ve been thinking about making my own clothes. The only experience I’ve had with sewing is hemming up a couple pairs of pants. I’ve never used a sewing machine, but I wouldn’t mind investing in one and teaching myself, if it’s possible to do so.

How hard is it to learn how to sew correctly? Should I have someone teach me or will it be pretty easy to learn?

Also, if you have any more tips on making clothes, please do share. Thanks! ^_^