Can you walk me through the process of purchasing on CoinJar? Are there any specific steps I need to follow? Do I need to create an account first, or can I just start buying straight away? Also, what payment methods does CoinJar accept, and are there any fees associated with making a purchase? Additionally, how long does it usually take for the transaction to be processed and the cryptocurrency to appear in my wallet? I'd appreciate any insights you have on the overall buying experience on CoinJar.