As the others have said it is a relatively easy job to do at home if you are fairly spanner savvy.
I’ve never used any form of locking tool for the cam pulleys as they’re not under a huge amount of spring pressure but one will turn a tad out once you take the belt off but just re-set it when fitting the new one.
Once the new belts are on just double check the timing marks are lined up and the tensioner are tight.
I’ve found a long Allen socket best to use as it gives you better access to avoid chewing the hex up.
https://www.ebay.co.uk/itm/123667398244
If you’ve not got one already buy a Haynes manual as there’s clear instructions in there and I personally like their method (the old factory way) of tensioning using a spring balance.
