Where to start? This may all depend on the space you are considering or your level of confidence and ability. I would recommend starting your DIY reno on a room that only requires cosmetic changes such as the wall and floor finish.
Plan the room: what furniture do you want in the space? What feel do you want in the room e.g. light and airy, welcoming and cozy, modern bright and bold?
Materials: Calculate the amount of materials you will need: work out the total wall area requiring paint/wallpaper/tiles and the floor area needing carpet/tile/polish. Are you wanting a new dressing for your window? If so, do you want curtains? Blinds? Shutters? Take all your measurements to the shop when purchasing what you need.
Curtains: Here's a little trick of the trade - place the curtain track as close to the ceiling as you can and have the curtain length fall all the way to the floor to give the illusion of a larger wall/space. If your budget does not allow for custom-made curtains, buy ready-made curtains and get an extra one or two. Sew the extra curtain, or a contrasting fabric, to the main curtains to get the additional length required.
Walls: Consider your wall paint finish. Do you want something that is going to outlast trending colours? Then, go with something neutral - white is still very popular. If you are more of a natural lover with lots of browns and natural materials in your furniture colour palette, then go for a warmer cream or very light beige. You can get many variations of 'white' these days. Most paint product descriptions tell you what other colours they complement. Always get a test pot and paint a largish sample area in your reno room to make sure you are happy with the colour. Keep an eye on the test area throughout the day to see how it looks under the different lights including electric at night.
If you have wallpaper, remove it this link will help;
and prepare the walls for new paint/wallpaper application. If you have any queries about any of the processes there are many DIY tutorials on the net;
Bunnings Warehouse have DIY nights where you can learn skills to help with wall-papering, use of power tools and more.
Cover the floor with drop sheets, tape up edges of power points, windows, skirting and doors - basically anywhere you are meeting something you do not want to get paint on. Start painting on the ceiling and work your way down the walls to the skirting. Once paint is dry and you are happy with the colour (it could take 2 or 3 coats depending on the colour and wall surface) remove the tape. Voila! New walls!
Floors: Its best to tackle the floor after the walls have been completed to save any damage that may occur during painting/wallpaper. Just like wall options, there are many floor finishes to choose from and some will depend on what is underneath your existing flooring. I am lucky enough to have original floorboards in amazing condition so it was an easy decision to polish them. I did toy with the idea of having them blonded to a lighter tone which would make the space feel lighter and brighter. However, as this is to be our long term home, I think the blonding effect will date and decided to stick to something a little more family friendly. I chose a straight forward polish with a satin finish which is perfect for high traffic areas. Other ways to re-vamp your floor could be to use tiles, carpet, floating timber or, if you have not-so-pretty timber floor boards you could consider painting them, which is right on trend at the moment.
With some ideas and a bit of elbow grease, a wall and floor makeover can make a room look entirely new.