Nearly two-thirds of Wales’ population will be under lockdown when new restrictions are imposed in three more areas on Monday.
From 18:00 BST, they will be in force in Neath Port Talbot, Torfaen and Vale of Glamorgan.
This will mean half of Wales’ 22 local authorities will be under lockdowns, affecting almost two million people.
The country’s two biggest cities – Cardiff and Swansea – had restrictions applied on Sunday evening.
“Rates are much higher in local authority areas which border our county borough but we are now seeing rising rates here in Neath Port Talbot,” council leader Rob Jones said.
“We need the help of everyone across Neath Port Talbot to prevent the increasing spread of coronavirus and to bring the infection rates back down.”
But wedding planner Gail Windley told BBC Radio Wales Breakfast it was an “incredibly frustrating” time for everyone involved in weddings.
“The rug is being pulled from under your feet constantly,” said Ms Windley, who lives in Neath Port Talbot.
She said one bride she was working with was “very stressed” and would be “glad to get it over with”.
“A wedding is a milestone in your life – that’s how your ancestors will trace you back – so it’s heart-breaking to be involved in that and see it.”
Torfaen council leader Anthony Hunt said the local lockdown strategy was working in neighbouring Caerphilly and Newport, where he said numbers had “dropped dramatically”.
A businesswoman in Cwmbran said she was hoping the local lockdown would not affect her too much.
“The majority of customers are local to Torfaen and I do online as well, so I am hoping, fingers crossed, that it’s not too bad,” said Rosa Newton, who owns an antiques and vintage shop in Cwmbran.
Ms Newton said she felt “better prepared” for tighter restrictions this time than she did for the national lockdown in March.
“Within the shop, it’s all face masks, hand sanitiser – I feel safe and I feel my customers are safe,” she said.
“I will switch to more online shopping. We have to just switch and do what we can as a business to keep going really.”
Liam Lazarus and his partner Bethan run a cafe in Swansea.
“It’s crazy – it feels like the goal posts are changing in the industry all the time,” he said.
“We were getting into a nice rhythm, so now this is happening we are taking a step back.
Vale of Glamorgan council leader Neil Moore said it had not been an easy decision but pointed to the rate of infection rising to 34.4 people per 100,000 in the county borough.
Blaenau Gwent on 202 per 100,000 and Merthyr Tydfil at 169 per 100,000 currently have the highest rates of infection.
Welsh local lockdown rules mean extended households are not allowed and people are barred from leaving or entering the council boundaries without a reasonable excuse.
People are allowed to travel outside the area for a limited number of reasons including going to work if they are not able to work from home, to go to school, give care or buy food or medical supplies.
Blaenau Gwent, Bridgend, Caerphilly, Merthyr Tydfil, Newport and Rhondda Cynon Taf were already under lockdown, while Llanelli in Carmarthenshire became the first town to have restrictions imposed which do not apply to the wider county.
Cardiff and Swansea both went into lockdown at 18:00 BST on Sunday.
First Minister Mark Drakeford said the position in the “north of Wales continues to be mixed”.
A meeting with the leaders of all six councils in the area will take place in the next week.
“If we need to take action, we will, but the position isn’t as clear there yet as it has been in the south and I want to make sure that we look at it with the detail it deserves,” Mr Drakeford said.