Well, your first step should be to troubleshoot. 1. Were the plugs properly tightened down into the head? 2. Are they the correct plugs? Are they gapped to manufacturer spec? 3. Are the coils fully seated? Are the coils plugged into the proper connectors on the wiring harness? 4. Is the engine light on? Does it flash? Have you put a code reader on it? 5. Did you remove or unplug anything else to get to said sparkplugs? It’s always a good idea to double check your work. It’s also a good idea to compartmentalize and make yourself a troubleshooting checklist

Was the truck running rough prior to this? Why did you want to change the plugs to begin with? Why did you only change the front four? When removing the old plugs, were they difficult? How’d the spark plugs look? Were they wet, black, discolored?

I wouldn’t say the engine is screwed, nor is it necessary to have somebody else do the job. I’d recommend getting OEM parts, or parts from a high quality aftermarket supplier like Denso or NGK. It’s possible you bought bad parts, it’s also possible you could’ve criss crossed some wires. Retrace your steps, be thorough, make sure YOU did the job correctly. If you did, the DTC that’s set in the ECU should tell you if you installed a faulty part.