Don't worry about the finances. Althugh some are easier than other, it takes a while to clean it out, place an order and wait for a knot to arrive and then fit it. All this can take weeks. Alternatively it's really easy to do particularly if it's an old handle. You don't need any electrical tools although starting the removal process through drilling a hole in to the centre of the cropped knot does help. All you really need to invest in is some sand paper and a bit of epoxy glue. I can certainly help you with advise and choice of knot. Have you any idea of the size of the handle? If you give me the e-bay link I can maybe get an idea