But most of all he dreaded hearing the phrase 'I just stuck a blonde dye on it".
"Then the weeks and months of me trying to get it back to the beautiful highlighted effect commenced," he says.
Like many hairdressers, Alistair, who worked for his step father's building company while salons were closed, will be working extra hours to accommodate the demand for cuts and colours.
"As it was being announced in parliament regarding the re-opening, my phone started going crazy," he says. "I took a call from a client during the announcement and whilst on this call I must have had 20-30 text messages within the 10 minute conversation.