Installation of H105

Hi,

While installing the H105 I first:

Put the back plate in, then put the double sided screws (standoffs)

then I secure radiator, then pump is screwed ...



Few questions:

1 When I first put the double sided screws how tight should I screw them to the backplate?



2 When im screwing the pump, should I "just hold it" or should I push it againt cpu, if yes should I do it with medium/small force?



3 How "tight" should I screw pump to the mb..?