No notice is required to the party on which the writ is executed; commercial premises can be broken into by the officer by any means they choose; and once present in a property they cannot be forcibly removed.
Obstructing an HCEO in the execution of a writ is considered to amount to a contempt of court, as was historically the case with sheriff's officers.
[1] This writ is essentially for debt collection, but it actually takes the form of an order to the officers to seize goods from the judgment debtor worth a particular amount of money; the HCEO will attend the debtor's premises, seize the goods, and then sell them at auction.
Once the writ is awarded, the judgment debtor can avoid the removal and sale of assets by either paying in full or agreeing to a repayment plan.
If they take this action, the assets will still technically remain seized and belong to the court until the debt is fully cleared, but are normally left in situ under a walking-possession agreement.