Dh and I together for over a decade, married for 5 years. We're both just turned 35.
We do want children, but it has taken us a very long time to reach that point. Up until around a year ago I don't think either of us was sure we wanted to do this. Now we are both sure - very sure - well, as sure as I think we'll ever be! 
We made a decision that we'd start trying (stopping preventing...) at the start of this year. I know it sounds control-freaky (why didn't we just start trying when we made the decision that we were in the children zone??!) but a) we wanted to wait for things to quieten down with both our jobs which were manic until late Nov/Dec and b) I am a control freak to end all control freaks at the best of times. But we were all geared up to throw away the condoms at New Year.
But It's three weeks into New Year, almost, and we still haven't been able to bring ourselves to have unprotected sex... It's mainly me putting the brakes on. I'm just FREAKING OUT. I know I want a child, I really, really do; no part of me doubts that any more. But after so many years of obsessively preventing pregnancy (even at times using 2 forms of contraception to be absolutely sure) I just can't seem to get my head into the unprotected sex zone.
Of course now it comes to it, all my old worries about parenthood are resurfacing - I've had major body issues in the past so of course I'm worried about body changes, I'm a health anxiety nut, so of course I'm terrified of giving birth, I'm a worrier by nature so of course I fret about how our baby will turn out and whether we'd do a good job as parents. But none of those things mean I don't want a child. I know I do. They just mean I can't get past the terror of actually trying to conceive one.
Any advice - apart from just to shut up, stop obsessing, and get on with it - all of which I already know I should do?!
I feel like I'm kind of failing at this before I'm even starting. :( What if I 'do it wrong' IYKWIM?