No, I don't plan 'lessons'. We look at books together for some things or I might ask them to research something and write about it. They are 12, 10 and 8 now, so it's a bit easier to do that.
For other stuff, as an example for textbook work, we use Galore Park for English. There's a fiction and non-fiction text in each chapter for DD. (10 chapters a year) Then various exercises, some writing suggestions, further reading. We will read the texts together and discuss the 'comprehension questions'. I don't make them write their answers. The grammar/spelling etc exercises, they do independently and occasionally orally with me. The writing is done independently, although we usually have a chat first to get some ideas going. The 'further reading' we have sometimes already read some of the books but we choose one that she would like to read and she does that alongside everything else. A chapter takes 4 weeks, so isn't too onerous even with an additional book that we use for a more structured writing task.
History varies: DS1 does his pretty much independently and I look over his folder every few months weeks.
DS2 reads independently but then discusses with me before doing written work on his own. DD is doing a history pocket at the moment and we talk about what she's finding out and I help out with cutting out (rather a lot of it!)
It really varies between the 3 of them and the subjects we do. A lot of the time they work through stuff and come to me when they don't understand or want to talk something through, which means that I finally understand Lowest Common Multiples and Highest Common Factors (which is more than I did at school!)
Art I do alongside them because I am really rubbish at drawing but getting better!
Sorry, that's a bit of a mammouth post!