I'm really glad to have found this thread, because I'm in the process of writing up one branch of the family tree, primarily for a relative so they can see what I've uncovered. It's very useful to see how other people go about it.
I've written about each person as an individual, which does mean it gets repetitive at times, but I couldn't think how else to do it. I have lumped some couples together where there isn't much information.
I'm really glad I'm doing it, because it's pushing me to look at my research again, double check things and then uncover new things, which is marvellous.
The downside is it takes ages. This has taken me months, and it's only one branch! My aim is eventually to write up every branch, as well as my husbands tree. I'm going to be busy in my free time for the next few years at least!
One thing I struggled with was lack of images, because I don't have any photographs. So I've been using some free image resources online, which have old illustrations and stuff like that. That's made a big difference to how it looks