The other guides are good. These are additional tips for when things go bad:
1) The pro career is broken up into seasons. If you fail to win an achievement tournament in the initial season, you will have additional chances in a subsequent season.
2) Quick rounds allow you to only play a few holes and still have a fair chance to win a tournament.
3) If winning a tournament is in doubt, consider switching to playing all 18 holes in the 3rd or 4th round.
4) If things are really desperate, you can access the menu, the home tab, and select Pro Career. This will take you back to the main menu and anything that happened during your last round will be lost.