Selling index funds is easy. First, log into your brokerage account and navigate to your current holdings. Identify and select the fund you wish to offload, and tap the 'sell' option. Input the number of shares you want to unload and specify your preferred order type (e.g., market or limit). Double-check all details for accuracy, then confirm and execute the sale. The proceeds will generally appear in your account's cash balance after the trade settlement period. Be mindful of potential tax implications and brokerage fees when selling your holdings.