To get easy lives beat the firstlevel. Once you have done that go back to that level and only go as far as the Expresso coin get that and press start and then select and repeat the process as many times as you want(the more times the more lives.

Another easy way is to use Rambi after you get the G go off the tree to the left when you go into the dich go to your right and run into the wall it will bring you to a "Stop The Barrell" bonus get the coin you want by memorizing the order, Expresso, Rambi, Enguarde, Winky. after you get out of that bonus go to your left and you will be in that same ditch keep going into the bonus and keep getting the same coins. Expressos bonus is the easiest.