Thanks MrQuickR1. I'll try to remove the bolt by drilling it out using my bolt extractor. If that doesn't work I will remove other bolts and lift up the valve cover like you said. Luckily it was the front corner one so easy to access.
Since I was also replacing my starter at the same time as this job, when I put my intake manifold back on, I snapped my oil vapor hose in half. Gotta run back to dealer today to get these few parts.
By the way I really like your DIY, the pics helped me out greatly with this install. So thanks a lot for making it.