its very important to follow the rules exactly especially for your first flush. When you have done a few you may decide to make a few changes , but most people come back to the classic Hulda Clark flush,
Dont forget the Epsoms dilate your bile ducts to ensure no disomfort when you pass the stones. I would absolutely NOT stray from the recomended dose.
And anyway when you have passed a load of stones hopefully on your 1st flush you will realise its all so worthwhile.
Personally i would never encapsulate the epsoms although I know some do. Obviously the solution will be better accepted by your body diluted with water, rather than spilling its contents neat as it dissolves inside you. make sure you have warm water to help them dissolve better.the time it takes to swallow all the caps is much longer than swigging the epsoms in a glass of water.
And as to how you will react, it will open up your bowels and clear them out, so there is a clear passage for the stones, so lots of time on the loo.
Just follow the rules and you will have no problem, stray, and you may. Good Luck.