I planned in May 2010 to TTC is Dec 2010.
mentioned it to my GP in May, when i just happened to go anyway... and again in October when i went to try and get a flu jab. (I was not allowed one by the way, until i explained that when younger id had asthma, GP had to get out the originals of my notes and then i was written to and was allowed one)
My GP honestly thought i was mad... planning so hard, every last detail... i wanted a baby due in September (or October 2011) and in my mind thats what WAS going to happen...
Dr was explaining it might take ages, but i planned to prepare myself and our bodies for months and couldnt see why if we were both fot and healthy it should take long!
I started charting in Augast (when i came off pill) so when the time came i could completley understand my cycle. Used OPK's as well just to confirm i was interpretting correctly (I was)
I started taking folic acid in Augast, and OH started his zinc in September. (sperm takes 100 days to make so ideally need to be taking it 3 / 4 months before TTC). A month before we planned to concieve OH took dad to be tablets, and I took mum to be tablets for 4 months as well.
I cut out caffine, alcohol complelty in the 6 weeks before planning to concieve and gave up aspartane as in the summer.
I made sure we slept in a pitch black room throughout most of my cycle, although around ovulation our black out blind was up.
We are both fit and healthy and neither of us smoke. We both eat very well, and cook from scratch, with local meat and veg, bake our own bread etc.
OH was also alchol free for the week before we TTC
I suggest reading Taking charge of your fetility, zita wests guide to getting pregnant, and maybe baby - making bible.
Anyway i did what i feel to be be EVERYthing possible to improve our chances of conceptiom.... knew my fertile times, understood my cycle so well... and sure enough i got pg straight away 
So many people thought i was mad doing s uch prepartion such a long time before but it worked for me!
I dont think its too early to start thinking about it.
Good Luck