Youíre giving half of the answers yourself
The answer lies in the question, sometimes:
Right, be yourself, give yourself all the time there is. Adjust your sight through the finder by either screwing a lens to the eyepiece if feasible and then no glasses or by turning the camera downside up for better glass-finder contact. Why cram your nose on the housing?
And yes, slowly increase pressure on the release button, just slowly and constantly until the apparatus comes to decide itís time to fire.
Third hint from me is―I know you donít like that―use a tripod. Take a solid tripod with you. Photography has to do with time. To have no time and haste around leads nowhere. 2013 will never come back again. Take a slice of time out of this year, carefully. It will show!