How do you deal with pest problems when DIY isn’t enough?

I garden in a pretty small urban space and usually try to handle pests myself, but every now and then it gets to a point where sprays and home remedies just don’t cut it.

When that happens, how do you usually deal with it? Do you call a professional, or just keep trying different DIY options?

I always find the “find someone trustworthy” part more annoying than the pest itself.