You need to be prepared by having a couple of empty jars, but everything else is really straight forward, generally from your store cupboard plus the key ingredient of big fresh lemons.   
I used this microwave recipe here, & whilst it probably still took 10 mins or so cooking time, there was no sticking - it was super easy.  There's more on my blog here.
I still need to decorate the jars & make individual labels & there is a warning - it's so good you'll want to make two batches so that you can keep some yourself (I did -  as shown above!)