Aircraft Part Numbers Aircraft Models - I'm Working On An Airfix Mirage 2000 And I'm Finding The Instructions Confusing - Help?

Aircraft models - I'm working on an Airfix Mirage 2000 and I'm finding the instructions confusing - Help? - aircraft part numbers

I understand that the numbers are only available in small quantities in the direction shown in certain places are. What does this mean? Nor should the paint and cement, the parties - before or after installation?