Install SwiftQueue.
You need two things: a WordPress site where you can log in as an administrator, and the SwiftQueue plugin file (a .zip). Nothing here can break your site — and step 5 shows you how to switch it off again, so you know the exit before you enter.
Log in and open the plugin uploader.
Log in to your WordPress admin (usually
yoursite.com/wp-admin). In the left-hand menu, click
Plugins → Add New Plugin, then the
Upload Plugin button at the top. You'll see this
screen:
The upload box in the middle is where your SwiftQueue .zip goes.
Choose the .zip and click Install Now.
Click Choose File, pick the
swiftqueue.zip file you downloaded, then click
Install Now. WordPress uploads it and shows a progress
page — this takes a few seconds.
Don't unzip the file first. WordPress wants the .zip exactly as downloaded.
Activate it.
When the install finishes, click the Activate Plugin button. You'll land back on your plugins list, and SwiftQueue will show as active:
Active means working — the background engine is already on, with sensible defaults. Nothing else is required.
Open the dashboard.
In the left-hand menu go to Settings → SwiftQueue Engine (or click Dashboard right under the plugin's name in the list above). The first time, a short setup wizard offers to tune the plugin to your site's size:
Pick the size that sounds most like your site and click Apply Profile & Continue. Unsure? "Small" is a safe answer for most sites — you can change it any time.
Know your exit.
If you ever want to stop: Plugins → Deactivate under SwiftQueue. WordPress instantly goes back to how it worked before — your chores still run, the old way. Deleting the plugin also removes everything it stored. That's it; there is no lock-in and no step you can get wrong.
Next: your first five minutes — what the dashboard is telling you, and the one checklist worth caring about.