First timer for a long trip, so excuse my ignorance.

I'm looking to leave in September 2015 to India. In view of the problems re Afghanistan, Pakistan, Iran I am looking to go round the Himalayas rather than under them.

I've looked at this route, and if I knew how to post it graphically I would.
London, Holland, Germany, Poland, Belarus, Lithuania, Latvia, Estonia, to St Petersburg, Moscow, Irkutz, Ulan Bator, Beijing, X'ian, Muse, Kolkata, Goa

I don't envisage any problems getting to Moscow.
The questions to all of you experienced overlanders are as follows What are the roads like in Lithuania, Belarus, Latvia and Estonia? If I keep to the main highways, I am assuming that the roads all the way to Irkutz should be good. Can anyone confirm that?

The road from Irkutz through Mongolia to Beijing also looks like it is highway. Any tips?
China itself I have heard can be a nightmare but I am planning to keep to the highways and visit Beijing for the China Wall and Forbidden City and X'ian for the Terracotta army. Other than that I will be heading down to the Myanmar border to cross at Muse? Any body had experience of crossing the border here? From what I gather getting from Myanmar to Assam in India should be relatively plain sailing. Or am being too optimistic?

__________________
2011 BMW K1300S in UK
2012 Honda CBR-250R in Goa