It's very easy to sell on eBay. If you are already an eBay buyer and have PayPal it's even easier. If you have a smart phone or tablet with camera it takes about 5 mins to list an item. Take some good quality photos of your curtains preferably while they are hanging up. Make sure you have the exact dimensions and description, make/ colour/ pattern/ fabric/ lined or not/ make sure if there are any flaws you describe these honestly and take a photo. You need to decide how you will send them or do you just want collection in person? you need to estimate the cost of postage - heavier items I would send with someone like Hermes who pick up from your house and are usually a bit cheaper. Decide on the minimum you think is worth selling the item. If you just want to get rid you can start the auction at 99p, if you think it's not worth the hassle of selling for less than say, £20 you can start the auction with that. I am always selling little bits and pieces on eBay and have a healthy balance in my PayPal account. If you start with a low reserve you can often find the bidding goes up quicker than if you start higher, if that makes sense.