Curious, as someone who is in the early stages of planning a B2B SaaS company -- can you talk any more to that? How do you get the clients without a product to show them?
On doing things manually: i send invoices once per year by hand (few hours of work), do accounting in ledger for 1h once a quarter, and handle uncommon requests directly in the DB (rails console is amazing for that, this happens about once a month), but have automated password resets as we were getting too many emails on those.