Where do I indicate what HST I collected as part of my self-employment income? How do I calculate and where do I enter HST I paid on my self-employment related expenses?

To do this, you will need to prepare a GST/HST return, where you report all the sales tax collected, and then recover the GST/HST you paid by claiming input tax credits (ITCs). This CRA website has more info on submitting a GST/HST return: https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/gst-hst-businesses/complete-file-when.html

If you have TurboTax Live Assist & Review, here is how to talk to a Tax Expert: https://turbotax.community.intuit.ca/community/navigating-turbotax/help/i-m-using-turbotax-live-assist-review-how-do-i-talk-to-a-tax-expert/00/873764