Until I realised this was the perfect opportunity to launch a Kickstarter. When I went onto the site to set the project up I discovered that I'd already backed no less than 17 of them. I figured it was a tried and tested way to see if the books had a market - I already had my prototype and imagery so I just needed to spend some time making a video, planning and preparing. I decided not to get too stressed about it unless I failed to get any backers at all!
In case it's of interest, here's the process I went through to set up the campaign (it took roughly a day):
1. Pricing - this was the first and most important thing I did. Do not pluck an arbitrary figure out of the air when you set your target! Make sure you will have covered your costs (or at least the costs you have to cover to avoid financial ruin!). You need to take into account a number of things - cost of your product, postage (which is variable if you're accepting International pledges), packaging materials (including any flyers, stickers and business cards - you might need quite a few!) and Kickstarter's fees. This figure may look scary and unattainable... Depending upon how scary it looks you may want to add a small profit too or only make a profit on the pledges after you reach your target. Do price it up properly - there's nothing more panic inducing or with the ability to ruin your "I'm funded!" celebrations than realising you're going to be out of pocket after all.
2. Rewards - once the pricing was sorted I needed to work out the rewards. All the advice I'd read (and most of the successful Kickstarter's I'd funded myself) had a reasonable range of rewards, not only to suit all budgets but also so there's something for people who may want to support you but possibly don't want your main product. So I offered a digital copy of the book, a postcard set, 1 copy or a slight discount if you pledged for 2. Different items have different lead times too - also consider that you won't receive funds until at least 14 days after the end of the campaign - so if you need the money before placing the order, you must factor this in to your estimated delivery date.
3. Video - everyone keeps talking about how important video is to EVERYTHING when for the most point I find videos in my feed irritating and scroll straight past them! Anyway, it had to be done. You're not getting me talking on camera anytime soon, so I used Adobe Clip to make a slideshow set to music (I used one of the Adobe Clip tracks so as to avoid copyright issues - don't forget this!) and I was rather pleased with my efforts.
4. Images - as I mentioned I already had 365 photos from the project, plus pictures of the book itself and montages so I made full use of these. If you don't have images you need really good ones/mock ups if you don't have a physical sample to photograph.
5. The blurb - I'm quite quick at writing when I get down to it... I rewrote a few things I'd already written about the project and added to/updated this. I explained the background to the 365 project itself, why I turned it into a book. You also need to think about what could possibly go wrong with the project and let people know the potential risks before they pledge.
And then I submitted it to Kickstarter for their approval. This took a few hours (even on a Sunday night - I was impressed!). I hovered on the publish button for quite a while before going for it.