[Quiet Man Cometh]

I wouldn't say starting from the middle is an "issue." Like some say, go with whatever works. I write short stories usually, and my start point is usually wherever I have the inspiration. Sometimes, I'm able to write a story more or less start to finish. Other times, I start with what I have and add padding until it fleshes out into something more or less complete, and still other times I write out paragraphs like puzzle pieces without much of an idea about what goes where and when and just piece them together as I see fit.

Writing novels is a long process and I think it's common for things to change as one goes. I'm not really a novel writier myself though I've tried many times, but I've worked with a couple friends as a beta reader of sorts and it's frequent that people go back to earlier chapters to make accomodations for actions or ideas that have come up later in the process. I think it's asking a lot to plan on having every detail mapped and worked out in order from the start. I'm not saying it shouldn't be done that way, go with whatever works, but I'd always be prepared and open to edits later on, especially if it can make things better.