chilli ,low pressure...how low? in a mountain area..you are enroute,cleared to descent to alt X which has a minimum 2000' obstacle clearance,am I right?
And, the moment you'll go bellow actual cleared altitude ,forgetting to change from STD to QNH, the ATC will advise you about that (their computer correct automatically for the QNH)..of course,you'll say now that in a remote,3rd world country....Then I'll say you have an EGPWS onboard..
Better to do all your checks correctly,and follow SOP ,and you'll be ok.
Basic CRM..