You are your home's best salesperson.
Nobody knows your home better than you (and you certainly know it better than an estate agent who may have only spent a few minutes in it). Nobody can impart as much passion as you and clearly no one has a better motivation to sell the property than you.
That said, you don't need to be an expert salesperson, just well prepared. Use the brochure to understand your property. Remember what made you buy in the first place. Why was it great then and what have you done since then to improve matters. Impart the positives but don't ramble.
Practice viewings. Listen to feedback and adapt.
Be relaxed, enthusiastic and genuine. Read more about how to manage viewings and show your house off. Link to Managing viewings and showing your home.