1: Don't overlook loose change or outdated coins - they could be rare treasures in disguise.

2: Keep an eye out for special markings or symbols on coins - they could indicate rarity and value.

3: Research common rare coins beforehand to help you spot them easily amidst the clutter at garage sales.

4: Use a magnifying glass to closely examine coins for imperfections and unique features that could indicate rarity.

5: Ask sellers if they have any old coins or coin collections for sale - you never know what hidden gems you might find.

6: Look for coins from specific time periods or countries that are known for producing rare and valuable currency.

7: Attend estate sales or auctions where coins are likely to be found in abundance, increasing your chances of finding rare pieces.

8: Join online forums or groups dedicated to coin collecting to learn from experts and stay updated on valuable coins.

9: Trust your gut instincts and don't be afraid to take a chance on a coin that looks unusual - it could turn out to be a rare find.