No trigger word needed. Weight of 1.0 works well on the SDXL 1.0 base. Negatives are usually not needed, but "blurry" and "low quality" seem to help. You can use simple prompts such as "hamburger" or describe steps you want it to show. SDXL does a pretty good job of figuring out the steps to make it.

Also available on Hugging Face https://huggingface.co/ostris/ikea-instructions-lora-sdxl