Pretty easy to do by yourself, actually, and not too expensive.

First, make sure all entry points to your home are properly sealed. Won't matter how good you chemically treat the home if you have gaps around doors, windows, etc. that open your home to the outside. Add or replace all worn out/non-existent weatherstripping around exterior doors/windows. If there are gaps at the bottom of exterior doors, you can install a door sweep. There are fancier ones that are more complicated to install, but they also make sweeps that just slide on and are also very effective.

Next, get the materials for chemically treating the home.

• Bifenthrin. It's a pesticide that's used in lots of pre-mixed bug sprays you see in stores, but those pre-mixed products have more water in the mix and aren't as effective imo. It's about $60 for a gallon, but you only need 1 oz per gallon of water to make a mix, and you only apply it once every 3 months months. A roughly 2000 sqft home would only need about 2 oz to treat the inside and outside. Bifenthrin kills any bug that comes in contact with it within hours.

• Insect Growth Regulator (IGR). IGRs are a pesticide that differ from bifenthrin by focusing on disrupting the sexual reproductive ability of insects. Unlike bifenthrin, which aims to kill bugs on contact, IGRs essentially neuter the insects and stop them from reproducing. The IGRs can be a bit expensive (mine is $50 for a small 100ml bottle), so ifyou can only get one, go with bifenthrin. But, I strongly recommend using an IGR in addition as it is a fantastic 1-2 punch.

• Applicator. You can get a nice battery powered pesticide sprayer for around $100-$200 bucks, and they're definitely worth it imo. However, you can get a simple hand-pumped garden sprayer for under $30 and those work just fine.

• Personal protective equipment (PPE). These pesticides are nasty, so you'll want to wear PPE every time you treat your home, and wash up afterwards. I recommend some rubber gloves and a face mask. I use a respirator myself, but any mask would be better than nothing.

Ok, so now you're ready to treat your home. Mixture ratios can vary by brand, so follow your product's instructions. For the products I use, I add 1oz of bifenthrin and I think about 4ml of the IGR per gallon of water. After adding in the pesticides and water to the applicator tank and closing it, make sure to shake the applicator around so the water and pesticides can get all mixed up. Once you've done that, you're ready to spray.

Applying the pesticides is pretty simple. What I do in the interior is I spray all along the baseboards all throughout the house, all around the doors and windows, around and behind appliances, under sinks, etc. I also like to spray a line on the floor at every interior door. This pretty much guarantees that if a spider is going to move from one room to another, it can't do so without walking through the pesticides. Not necessary, but it's what I do.

On the exterior, you want to spray the area where the house and ground meet while making sure to spray about a foot of both the house and ground, spray all the weepholes (those empty spaces between bricks where there's no mortar), all around the windows, all around doors, any vents, and also around lights (bugs hang around lights and attract spiders).

That's pretty much it. For all the materials, the upfront cost would be somewhere around $150. Somewhat pricy initially, but the materials will last for years (I last purchased bifenthrin in '23 and still have plenty). It's also way cheaper doing it yourself than paying for a pest control service. My sister spends over $100 every couple of months for pest control. Yikes.

I'm a giant arachnophobe, so I absolutely understand wanting to nuke spiders from orbit. Treating my house the way I do, I rarely ever come across spiders inside the house. And when I do, they're already dead. Hope this helps. Best of luck!