Like this, it will actually take quite a while to reach a number that is close enough to the yellow color you've chosen that you can't tell any difference (and mathematically, you will never actually reach an average of 4!)
Fortunately, you can always get your primer tinted for free. Getting your primer colored the same as your paint will save you a coat of paint. Of course, I always recommend doing a minimum of 2 coats of paint so that your finish sheen looks consistent.
Proper rolling technique: When rolling paint on the wall, get the roller skin evenly loaded with paint and make a V,N or M pattern on the wall, this is to spread the paint across the entire section you will be rolling, then roll back across the section and even out the paint. To properly "lay off" each section, make a final pass of the section applying light pressure to the roller frame arm end of the roller skin and bringing the nap mark (mark created on the pressure applied side of roller skin) across from the beginning of the section to the end of the section, and just repeat all the way down the wall.The V,N or M pattern, will be determine by how far the paint will spread, a V is for less spreading paint and M is for farther spreading paints. Do not "dry roll", which means trying to roll to much of a section at once with very little paint on the roller. Just as important, do not apply to much, if you find you are applying to much, increase the size of the section you are painting i.e. from a V pattern to an N or a N pattern to a M.
So how does a paint company accomplish this color hypnosis of potential customers? Well, it starts with the sample card. Have you ever noticed how the brightest, most saturated color sample cards are always the first row you see in a paint display? Well you guessed it... paint companies are playing with a loaded deck (of sample cards, that is)!
After the siding of your home is painted you can now start on painting the trim. There are a couple different ways you can go about painting the trim of your house. The first way is to mask off all of the trim so that you can merely spray the trim color on to your house, and the second way is to roll the trim by hand. If you are the only person painting the house I would recommend rolling the trim by hand. The reason being is because it takes a long time to mask off all of the trim on your home compared to just rolling the face of the trim boards. If you have multiple people, it would be faster to have the helpers mask everything off while you start spraying the trim color.
Satin or silk - Water-based vinyl or acrylic paint for walls in high-wear areas, such as hallways and kitchens. A satin finish will be slightly shinier than silk.
Satinwood or semi-gloss - These paints are commonly used on woodwork, such as skirting boards. This sheen level is between eggshell and gloss.