Worst was with ionic and ios. Havent really worked with either and got mac that wasnt updated in ages and also they didnt give charger. Dealing with sudos and not using sudos then trying to work with xcode and free licenses took me a good time until i got first successful build for iPad. Biggest time consuming mistake was that i had to logout of itunes before i could make another account. It only gave me error and said try again later. Made me furious but after i got setup working everything worked quite nicely. Loved the safari developer view.