Regarding using instant yeast vs. active dry yeast, I only use instant yeast.
I use the same method Mr. Marshall mentions, mixing dry ingredients,
including instant yeast, first, then adding the liquid. I use a
bread machine to do the heavy work (I don't have a stand mixer).
I find for a standard loaf of bread, just one teaspoon of instant
yeast is sufficient.
Many years ago, I too used active dry, but it is too much work to use anymore.
Regarding instant yeast, I find buying larger bulk packages much
cheaper than buying the small jars at the supermarket. I usually get
SAF through e-Bay and store it in the freezer. It will keep for years.
I keep a small jar of yeast in the fridge for regular use.