If you're a regular, then once again a purely subjective opinion as to how you see effectiveness, satisfaction and convenience will determine your choice. If you decide you want to make up your own, choose a recipe and when you have all the ingredients at home follow the procedure as below and remember to stick rigidly to the quantities, especially flavouring, that the bait company have told you to use. You will have to be either very experienced or have a lot of inner confidence. If you use a bait company recipe, you'll at least know that it has been successfully field-tested and has caught carp to a greater or lesser degree simply by virtue of the commercial repercussions of selling a duff product. Your killer boilie will have no such backup if you are unfortunate enough to start grinding out the runless hours.
Any new bait has that high anxiety factor, but something that has no track record makes it worse.
Have clean hands. Servicing the car's carburettor directly beforehand is not a good idea. Crack required number of eggs into a large mixing bowl and measure fluid ounces if required. Add any kind of flavour to the eggs at this point and gently whisk them until completely blended. Weigh out all the dry ingredients into another bowl and blend together with fingers.