The video for this kit is very useful. I watched it several times, finally pausing the video, taking notes to refer to while actually using the kit. Be sure to read the kit instructions too. I used the kit on a 1998 Mercury Grand Marquis.I followed the instructions exactly to maximize success, sanding for the full 5 minutes for each sanding/polishing operation. For the three grits of sandpaper plus the compound, times two headlights, it took a full 40 minutes of sanding/polishing. The headlight surface should be kept wet while sanding/polishing. Altogether it took me about 1  hour and 45 minutes to complete the job. One thing:  be careful not to use too much pressure when using the #400 (coarsest) grit sandpaper to avoid too-deep scratches. For the finer two grits and compound use firmer pressure. The video mentions this.There's a lot of rinsing and drying to be done and I used nearly a half roll of paper towels. Rather than a bucket or hose, water in a spray bottle works very well for rinsing; much better control.Not mentioned in the video, but in the kit instructions, is this VALUABLE tip: Complete the sanding/polishing/rinsing/drying steps first on BOTH headlights before applying the final step, the UV clearcoat. This avoids inadvertently wetting the  clearcoat (with drifting spray) on the completed headlight. Lay the coating on rather heavily, but not so much as to cause running or dripping. The coating must set for an hour in order to cure to the touch, and accidentally wetting it could be a problem. Also, it's MUCH easier to clearcoat both lenses at the same time. Otherwise the already-used blue applicator cloth will dry out in a short time and you'll have to refold and fiddle with it trying to create a neatly folded, usable application edge.Another tip: I cut the sandpaper sheets in half so I could use a fresh piece of each grit per headlight.I chose the Sylvania kit because it was the only one I found that has the protective clearcoat that  affords UV protection and long-lasting results. Although many kits make use of a drill or other power tool, hand sanding and polishing avoids possible wandering of the power tool and allows getting into corners as well as providing control and "feel."Bottom line: VERY pleased by the results. The lights don't look brand new (probably because the internal reflectors are not pristine), but pretty darn close and MUCH improved. For me it was well worth the money and effort. I gave it 4 stars because (for me) there are so many steps. But the very good results might well deserve 5 stars.