Forest have just completed a 15th season in succession outside of the top-flight, finishing in 11th spot in the Sky Bet Championship table - seven points adrift of the play-offs.
They held a top-six position for long periods of the campaign but slipped out of the reckoning due to a poor run that produced only two league victories from mid-February onwards.
That led to Billy Davies being sacked as manager, bringing an end to a controversial second spell in charge for the fiery Scot who made his agent and adviser Jim Price acting chief executive and also imposed a near media blackout at the City Ground.
Replacing Davies is Forest legend Stuart Pearce - himself returning to the hotseat after a brief spell in caretaker charge in the mid 1990s - and Al Hasawi insists there will be no repeat of the errors he feels he made last season.
"I don't like [what happened] but it was my mistake, not their mistake," the Kuwaiti billionaire told The Guardian.
"This was down to me. I trusted everybody in the club. I gave them everything. 'Do whatever you want to do.' And this was wrong.
"It's happened now. It's the past and I've said to Stuart Pearce: 'Listen, nothing against you but there are rules now.' He said: 'Fine.'
"He agrees and that's good because, first, I don't like a manager who interferes with the administration. Second, I don't like it when the administration interferes with the football. Everybody has his job. The manager... we will give him everything."
Looking to the future, Al Hasawi is determined to take Forest back into the elite but has urged fans to remain patient.
"It is just going to take time," he added. "Manchester City were mid-table when Sheikh Mansour bought the club. It's only about money.
"But who pushes Manchester City? An entire government. And who pushes Forest? Only Fawaz al-Hasawi, with nobody helping him. Nobody, even from Kuwait. No sponsorship. Nobody. Even the company we have [for shirt sponsorship], it's our company.
"So we are pushing with one hand. Manchester City have a government behind them and when you have a government behind you, it is different to one man. It will happen with one man - but it will take longer."