Fortunately there is now a tool that makes it easier to create accounts using Resource Credits. The tool was just released hours ago and can be accessed in here: https://codebull.github.io/AccountCreate/
With the blog post published to the Steem blockchain found in here: https://steemit.com/utopian-io/@reazuliqbal/steem-hf20-discounted-account-claim-and-creation-tool which was already evaluated by a utopian mod.
If you want a code tutorial then you can read this great post explaining in great detail how to use RC to claim discounted accounts: https://steemit.com/utopian-io/@mcfarhat/hf20-tutorial-claiming-and-creating-discounted-accounts-1538321171071
Or directly download this script: https://gist.github.com/mcfarhat/eae9c6c9e12e95cf76e492cbe1721d3a