When we were specifiying our house, most of the upstairs bedroom windows had to be obscured up to 1800mm or so, so that you couldn't look into the neighbour's windows or backyards. It cost more, and that's because the actual glass is replaced by special obscured glazing. Part of Rescode, so there's no way to get around it. But our powder room and ensuite windows are clear, meaning we can see out - and people could see in. The solution to this issue then, is to add frosting/obscuring film, so that looking in or out isn't possible.
For a DIY, this is about a 7/10 for difficulty - it's easy to do, hard to do well. Anyway, what you'll need is some obscure/frosted film, Bunnings may have it, or you may be able to buy it from a window tinting place. Also some scissors, a sharp blade, a measuring tape, and ideally a helper.
Anyway, Step One: Clean your windows thoroughly, scrape off any excess silicon holding the glass in, and make sure it's fully dry. I also got a little step stool to help clean the top of the window.
Step Two: Apply the film to the window. First measure the window size, and add a few centimetres all around as you won't be able to position the film exactly spot on. Peel away the first 20cm or so of the backing paper, and with a helper, position the film so that it entire covers the glass area. Press down with your fingers to get it to stick to the window. If it's off centre, you can pull it off and re-apply, I did this many times.
Step Three: Once you've applied the film reasonable well, use your fingers or a plastic card to push out any air bubbles.
Step Four: Use your sharp blade to trim away the excess, using the window frame as your guide. I screwed this up on one window, trimming too far away from the window frame, so I'll have to redo the window later on.
And that's pretty much it - frosted windows for privacy.
So, if you have any windows that you want obscured, you could give this a go. The film shouldn't cost any more than about $35/sqm, and the worst that can go wrong is that you screw up applying or trimming the film, and you have to start again.
Other things we did today? We were meant to pick up a couple of almost-new King Furniture couches from a private seller, but she reneged on our deal despite a deposit left and a written contract. Pretty sad, poor behaviour. I won't name names, but if someone with a name similar to "w3ndy gr4nt" from a suburb similar to "k3ilor 3ast" wants to do business, don't trust her one bit. Anyway, we ended up spending a small fortune today, what with the King Furniture floorstock clearance sale yielding a brilliant find for our sitting room, and a good deal at Bay Leather Republic for electric home theatre recliners in the softest leather in the world - looks like we won't be spending this Christmas squatting on the floor at least!