After this use the soft brush and with soft movements of the hand and the brush remove the layers of dust. Do not forget where you have taken all the studs from. If you forget it will mean that you will not assemble the laptop that easily after the cleaning.
The radiator is the next thing that you will need to clean. It depends on the type of the cooling component used in the specific model of laptop. If it is classic one with vanes, you can clean it just right there without necessity of removing anything. The dust from this type of radiator can be blown away with compressor and after this to use tweezers to remove every dirt left. And if necessary the soft brush can be used again. Be sure that the ventilator and the cooling systems are in the same box. To check it just see the instructions. If no information available, try to use internet and search engine. As far as ventilators are concerned, they can be cleaned with ear sticks, too.  Using compressed air is not good idea, because its usage can lead to whirling the ventilator to the opposite site and to damage them.

And when you are finished with the cleaning and before closing the lids, check carefully the inside side of the corpus and clean all the dust and dirt stuck in the joints and fossettes of the laptop. You can use compressed air again.

So now you are ready. Look for last time if you have not forgotten any of your tools inside the laptop. If you close it with any tool left inside, this will lead even to burst of the laptop. If not so extreme consequences, at least the laptop will be damaged irrevocably. When you have checked everything, screw the studs. Every stud has to be at its place and try to remember where you have taken each one from. Leave your laptop to get used to the surrounding and the temperature. Half an hour is enough. After doing this you are ready to use your laptop again. Be sure that the temperature is not too low or too high. And if all this seems too difficult for you, just give some money to a specialist to do this instead of you. This is the easier way.