No, it is not. The path, though treacherous is clear and well laid. Only after Bhojawasa you need a guide for the Tapovan. But, you can easily mingle with any other groups already present there.
The best time to do Gomukh trek is during the month of May - June and Aug – Oct. I guess it won't open till last week of April. So, make sure to call a few local people before a few days before the trek.
Is it good to attempt the trek in 3rd week of April, 2019
You can get travel guides there