Timing belt AISIN or OEM Volvo

I've done many timing belts. The locking tool is a "nice to have" but certainly not required. You should be checking your cam sprocket alignment before turning the engine over, anyway, so just take your time and be careful and you'll avoid most issues.

I would just buy the Aisin timing belt kit TKT-031 and then seals from the dealership (or an online Lexus/Toyota OE website)

The Aisin kit will have OE parts, where as other brands probably won't (Dayco definitely not, Continental is a mixed bag)

Nothing is really hard at all to work on with the UZ series V8s. They're not even that expensive either - a complete Aisin timing belt kit with a new Aisin water pump, Japanese idler pulleys, new tensioner and Japanese belt costs less than the Dayco kit from Autozone.

Just go to Rockauto and get the Aisin Timing Belt and Water Pump kit, its like $170 and you're getting OEM parts.

But I would do a Lexus and go the extra mile for the Toyota OEM TKT Aisin kits for timing belt/pump/tensioner replacement.

Highly recommend using the Aisin Timing Belt kit (TKH003) as it contains the actual OEM parts in a kit without having to use more expensive Honda parts.