I agree with what the other ladies have said re food/cosmetics etc. I'd recommend reading up to find out what the ideal is, but then decide what you can/want to do and don't stress over doing it all.
I intermittently had alcohol and caffeine whilst TTC (to be honest now I can't 100% remember how much but not loads, maybe 1 or 2 drinks a week and 1 coffee a day). I generally ate well and don't tend to have micro meals (although I am partial to a take away/meal out). I stayed on semi skimmed milk as I can't stand full fat, and probably only had 1 portion of fish a week (when I remembered as I'm not used to eating fish much). I did do more eggs, more milk, protein with every meal (tried to minimise red meat and have more chicken/turkey) - that was all pretty manageable for me. I also ate more nuts, fruit and veg (tried to do min 5 a day), and drank more water. I also took pregnacare/seven seas conception tablets.
To be honest I didn't check or change cosmetic products or cleaning products but at times (like during 2WW) I probably let my OH do the cleaning a little more (any excuse LOL).
It felt like a good balance to me. I made enough changes to feel like I was giving it my best shot without feeling too stressed about making loads of changes. I know you want to try to put the odds as much in your favour as possible, but don't be too harsh on yourself. Remember that people get pregnant whilst drinking loads, smoking, taking drugs, eating junk food, etc etc. Anything that you are doing will help. Try if you can to not stress too much over this.
Good luck x