I think the best tip for trimming your shrubs is to buy a good quality pair of garden shears from the start and then take care of them as much as possible.
A good quality pair of shears will last you for thirty years or more. Particularly if you follow the advice in the article and keep them sharp and oiled. So many people will just drop their equipment in the grass after using it. It might not seem like a few days could affect the tool but it does.
Shrub trimming tools, like any other kind of tool, should be respected. If they are, they will last you forever.