The Loose Women regular recorded an interview for Piers Morgan's Life Stories last week.
"I personally think he found the right balance," Welch told Digital Spy.
"I think his intentions were maybe to be a bit harder, but he was incredibly empathetic when I was talking about my battles with my illness."
She continued: "He's a very good interviewer. He really is very good. I've done millions of interviews and sometimes the people - they're either not that clued-up on their subject or they're not interested in their subject.
"They're listening to what's going on in their ear, they're looking at their next question - he never took his eye off the ball. I would digress and he would bring me back."
Welch added: "He was quite hard on some things but respectful when I absolutely made it clear that I didn't want to go down certain roads.
"We had some laughs - we made each other laugh; obviously I cried. I was sort of planning not to, but lots of areas are much easier to write about than they are to talk about.
"I was obviously discussing things in incredible depth and detail under different circumstances than I have done before."
Welch releases second autobiography Starting Over this month.