The addicted brain protects its continuous supply of the substance(s) it thinks it needs to function. It does this by engulfing the addicted person in denial. There’s no doubt that someone preparing to enter treatment will have doubts and hesitations. Although this can make it difficult to enter treatment, remember what made you decide to enter treatment in the first place.
Next, evaluate each part of your life; work, home, friends, family, finances, etcetera. Tie up loose ends and spend time with your support system. Pack a minimal bag with only vital necessities. Take care to leave things that could be triggers or distractions at home.