Sending an invoice feels like the final tile in a long line of dominoes. It gives you a sense of completion and accomplishment, and you can finally get compensation for the work you have put in.
However, before you can send an invoice, you have to create one. Then, you have to track it. The entire process is quite inconvenient and cumbersome in addition to having to wait for your client to pay. If you are still doing this manually, you might want to switch to mobile invoicing.