Developing Time

Here it is, I exposed a roll of ISO 400 film thinking it was a ISO 100. I know in order to have good negs I need to pull it by 2 stops during developing. Question is how do I go about it? I have not really done any processing in quite a while and am quite worried of messing it up. I would like to use T-Max dev for Ilford Delta films, is it advisable to do so?

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