I use http://www.romancart.com/, it`s superb and pretty easy to configure, it allows the use of Paypal in a far more usable way than Paypal`s own cart, and it still allows payment to be made the old fashioned way, cheque, Cash , bank transfer etc.
Have a look through my website, I don`t mind if you create some false orders so you can see how it works, just don`t use credit card or I will leave the country.
Oh, I forgot to mention, no special knowledge needed, so long as you know where to paste your html code, and it sound like you do.
Need any more info, let me know.