Map of the way from Paharganj to New Delhi metro station with pointers (click to enlarge; directions below):

metro map

Map taken from

Directions: from the main entrance to Main Bazar go to New Delhi Railway Station by crossing Chelmsford Road (on some maps marked as Qutub Road, probably that’s the same street) and go inside the Railway Station building to its right side. There’ll be stairs that lead up to the bridge over the railways. At the other end of the bridge go downstairs and exit the Railway Station. New Delhi metro station should be noticeable from there. This is the metro sign:

delhi-metro-logo-635 DMRC-Delhi-Metro-Rail-Corporation-

Photos of New Delhi Railway Station:

(photo source)

Inside the bridge: