Have you ever really thought about doing this? The idea of it might be a bit awe inspiring at first, but if you don’t fly into a panic, of course, this is possible. Now, all you need is a subject for your mural.
So, if we assume you are going to bite the bullet and do this, you will not want to do this on a dirty and dusty wall. So don an apron and get a bucket of water, some detergent and start washing the wall.
Once this is dry, you can make a bit of a start by giving the wall a coating of paint or a primer. This should, in fact, make it easier to paint your mural.
Second step, so now you have prepared your wall. How do you go about it? On the assumption this is quite a large area, I would recommend that you use a grid. For this you will need to work this out on some paper in the first place. Get a sheet of A3 paper and make a grid, draw 2 inch square boxes on it. Once this is done you need to work your design on and over the grid. If you have followed me so far, now you need to transfer the grid to your wall.
You can do this by using a chalk that will show up on the wall and you should not encounter too many problems when you try to remove this later. So, if you take each 2 inch square from your sheet of paper as a 2 foot square on the wall, you should get the gist. If your area is small you could do 1 inch to 1 foot! Whichever you do, the amount of squares need to be exactly the same as the grid you have drawn.
Do not make the mistake of making your grid pretty small, or you may have difficulty getting rid of the chalk marks. Whatever you choose to put in the grid, make sure that it has good, clear, outlines for you to follow.
Basically, using this method you need to copy your sketch onto the matching squares on your wall. It is important too, before you paint, to consider which is the best type of paint to use. In most cases a good make of acrylic paint should work well, but, depending on the size of your mural, this could work out to be quite expensive.
It is essential too, to be using a good brush. If money is an issue with the paint, use an ordinary house paint for the background part and just use acrylics for the main details.
You may find, you need a special type of paint that will withstand the sun beating down on your mural. Take a few moments, now and then, to just move back from your mural and see how it looks from further away, as well as right up to it.
Anyway, the paint needs a matt finish to it, so you will not suffer from the light bouncing off it. I really think when you have completed your mural, it would be advisable to, as protection, add a coat of a clear varnish. This will be a bonus later when you want to wash and clean your mural.