Modify existing WooCommerce template from PSD by josece

I’m kind of new here, what I need is to modify an existing themeforest theme to match a design that I will provide in PSD format, we are talking of around 11 pages. Here’s the link of the themeforest… (Budget: $3750 – $11250 MXN, Jobs: CSS, HTML, PHP, WooCommerce, WordPress)