Just depends i guess, i fed Noodle the night after i got him and it didnt seem to do any harm, tho people say that just to leave it to be sure, but me personally. Didnt have a problem with it
Try putting yourself in snake's position - he needs to get used to new home and new environment and new smells and new owner, thats enough to make any snake nervous about eating. Leave him to settle in, just change his water each day and straighten his viv a bit so he gets used to your smell. Its better doing it that way than risk stressing him by trying to feed him when he may not be ready. Sorry to repeat already given advice but it is good advice! xxx