My noob question:
Yesterday, I converted approx $1500 worth of XMR to BTC via Changelly.
Looking at the transaction page on Blockchain.info I see 5 confirmations with a figure of 0.00973 BTC ($124.64 ish)
Am I correct in thinking that with every confirmation that happens more of the BTC is "released" and hits my wallet?
The $124 worth of BTC *is* showing in my wallet.
No, that's not how it works. Every confirmation means that there has been another block build onto the block your transaction was confirmed in, -- The more confirmations, the more secure your transaction is against 51% attacks and other mining attacks.
You don't get "more" bitcoin with more confirmations..
Some services do require 1-6 confirmations, before your bitcoin is released. ( due to double spending & other mining attacks)