While the recommended tools enhance precision and the overall experience, they are not strictly necessary to start. You can use regular ice cubes, standard measuring spoons for ounces, and any long spoon for stirring. As you get more comfortable, you can invest in specialized bar tools.

A good quality blended Scotch whisky works best, as its mild flavor won't overpower the Drambuie. Avoid heavily peated Scotches initially. Drambuie is crucial for a true Rusty Nail; it's a unique Scotch liqueur with honey and herbal notes, and there isn't a direct substitute that will yield the same authentic flavor profile.

Yes, 15 minutes is a realistic estimate for a beginner, accounting for gathering your ingredients, preparing any specialized ice, precisely measuring liquids, and carefully stirring for the recommended duration. Crafting the optional lemon twist garnish also adds a minute or two. With practice, you'll likely complete it much faster.

Stirring is vital for chilling and mixing the ingredients without aerating them, which would alter the texture. Stir gently for the recommended 15-20 seconds. To avoid over-dilution while ensuring proper chilling, use large, dense ice cubes (like the clear spheres) as they melt slower than smaller, standard ice.