Yes there are quite a lot of visa restrictions but once you have a plan it all flows freely. Overlap your visas by a a few days or even a week where you can as this gives you the option to hang around or 'get out' of that great/crap country. Also don't be tight with your visas, pay a few extra $$$ to extend them. You never know whats going to happen, you may want to stay in one spot for weeks (ie the Pamirs) or have a breakdown requiring parts to be flown in. You wont want the stress of visas once that happens!
Also know the protocol for extending your visas incase the poop hits the fan. You will be better prepared to deal with it on the ground then.
Don't let this all worry you though, its far easier once you are on the road! You will be surprised how many people are out there travelling in remote areas and don't have a clue what they are doing!
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