I've a question.
How important is it to apply the correct torques?
...i see plenty of "professionals" do it without torque wrenches (tyre guy, garage guy, Even the Triumph guy, ...).
Sometimes, it can be critically important -- other times, not so much.
Professional mechanics work with wrenches and fasteners every day and learn the differences between torque specs -- they also tend to use appropriately sized tools for the fastener and torque spec (large tools for big/heavy; small tools for small/light).
They also tend to learn the consequences of not being attentive to (important) torque specs...

Of course, there's nothing better than being exact -- but, veteran mechanics may have a good sense of what torque is required - when.
An old mechanic once told me: "They were building motorcycles long before they were making torque wrenches."