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You can certainly go to your local home improvement store to by and use pesticides approved for consumer use to get rid of insects around your home or business.
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Do you think there will be any medicine which is not available off the shelf that the pros will need to come in for?
There usually use same chemicals just may have in larger dose or concentrate.
What kind of insect problem do you have?
They have granulars can sprinkle into lawn to kill the bugs where they hide as well as sprays to create a barrier around your home.
The key is to be persistant to keep the areas clean from food supply and then treat areas have seen the little critters wondering to dwindle there number down till move on or perish.
If do not have a safe place to hide and an easy food available will look else where or be killed off.
Would have a look at your local hardware store and get a broad spectrum pesticide that will last few months where sprayed to help kill and keep the bugs under control.
Does that makes sense and do you have any other concerns?
Can find local exterminators here if the issue warrants.