It usually helps, to have a plan. Write down your wishes, make sure your birth companions will know what your preferences are. Do not restrict yourself to the best case. Things may go not as planned and you all will need to adapt then quickly and smoothly. You don't want to do too much thinking while you are in labour.
Write those dreaded words: "In case I need C-section...", "If forceps delivery seems necessary...", "If I need pain relief". Hope for the best, but prepare for the worst. If you'll end up with a C-section, you will still want to have immediate skin-to-skin contact and breastfeed as soon as possible, right? Write it down then. Remember to be open-minded. Even if you want to go all-natural, you might at some point decide that you need "something", to get a short rest. This can be a trade-off - a bit of a drug can offer you enough rest so you can find the energy to push.
The optimistic version is that everything will be great and you will have the time of your life, but if the optimistic version is the only one you accept and if it does not work, you will be bitterly disappointed. The last thing you want is lying down next to your perfect healthy newborn and crying for the birth that did not go as planned. Remember that this is a game and nobody can guarantee you will win your first-choice prize - you can only prepare yourself as well as you can, to be able to say afterwards that you have given yourself a fair chance.