Lyle McDonald's Rapid Fat Loss Diet is a crash diet. He actually states this. I would strongly recommend against crash dieting, especially a PSMF. You will likely be miserable the entire time, break down at the end, gain it all back and then some, then feel like crap for weeks later as you now look even worse. IMO, stay away from it, cut your calories a little at a time and slowly lose the last few pounds over 10-12 weeks.
Don't put your trust in anyone on this forum, including me. You are the key to your own success.