You would normally use masking tape under the cornice and ontop of the skirting boards. You will need a brush or a cutting in tool (sponge thing). Cutting in is where you paint all the outside of the wall (4 sides iykwim). You normally use a brush if you have a really steady hand.
Normally you paint the outside of the wall first (cutting in) then you use the roller for the rest. And you should start the roller in the middle of the wall, then go up and down.
You'll need a roller and a brush. By cutting in, I mean like painting a strip using a brush along the skirting (window sill, doors etc) as you can't get the roller close enough. Once the cutting in bit has dried, then you can paint with a roller.
Does that make sense?
ETA: danni explained it much better than me, lol!
You can actually buy a cutting in tool. It is a square plastic thing with a handle on the back and roller type material on the front. You just run this along the edges of the walls as explained above to 'cut in'. This might mean that you don't have to worry about taping the cornices and skirts. You should be able to buy one where ever you get your paint and I don't think they're all that expensive. No more so than a good cutting in brush would be (need to have long bristles and be of good quality).
Good luck!! Once you get started it won't be that hard. I painted a room a few years ago and it came out alright even though I'd never done it before.
If the walls are ok a scrub with sugar soap (gloves on) will be fine.
You will need a brush to cut in - there are ones designed for it.
I hate rollers, they flick paint everywhere and it can be hard work maintaining the right pressure. When you go to Bunnings for your supplies check out the uummm whatsit called - umm pad painters I think they are called. It looks a bit like a mop head and its HEAPS better to apply paint with rather than a roller.
Wash down walls with sugar soap (I'm using sugar soap solution with a roller as I have rendered brick walls and a spongue will just break up) - sugar soap will get rid of any grime/grease etc
Fix any holes etc with a spacfilla (I don't need to do this - walls not smooth)
Sand over where you've fixed holes
Start painting
You have two choices when it comes to painting
1. cut in the corners/edges first & then paint (with either roller or brush); or
2. paint main parts of wall first and then cut in the corners/edges
I have a paintbrush with a diagonal edge to it for cutting in
Make sure when painting (with brush or roller) that you do not overload the tool as you can get drips.
When picking colours - get pieces of plasterboard and paint the tester colours on there (at least 50cm x 50cm blocks) - sit those against the walls and look at the colours in all lights (daylight and at night under bulbs etc) - that will give you a good indication of the colour in the room (saves painting it on the wall and hating the colour & deciding for something lighter and then having problems painting over the paint swatch)
When you buy the paint, buy a couple of plastic drop sheets. They only cost a couple dollars each and will stop paint drops on the carpet. We used tinned tomatoes to hold them down.
If you use powder in your washing machine, the boxes usually come with little plastic scoops. We save these, and you can use them to take the paint from the tin into the paint roller tray. Try to prevent drips on the edge of the tin, cos they make it messy when you are putting lid back on and moving tin later. If you hold brush under the plastic scoop while transferring from tin to tray, it will catch the drips.
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