I think the idea of having 1 CV can be misleading.
Generally, most people can do multiple things, so you should tailor the CV for the job - after all, it's only a stepping stone to an interview. The interview's where the decision is made.
(I had to interview people to work for me)
And experience - in almost anything - speaks louder than certificates.
I want to hire someone who likes doing things, is enthusiastic, etc. 6 degrees in rocket science is no good if they don't fit in with the others. Running the left handed blind tennis club is better.
So, have a bunch of skills, experience, etc. ready written down (where most people start) but then, instead of endlessly tweaking it to condense it down to one final CV, just pick out the relevent bits for a specific application.
I've heard people suggest to basically write the job advert out as your CV, but that's probably taking it too far.
And as someone else said... relax... it might take a fair few applications, so don't pin hopes on the first one.