Want to go to central asaia for first trip with friends

Im a part of this small group of 3, and for the typical first lads trip we dont want it to be somewhere like barcelona or ibiza to party, for a while weve had this dream of going to central asia and disconecting ourselves from outside, were all 16 this year and are planning on going when were 18ish, We all decided a multistep trip would be the best idea, we are factoring in 1 country from each person which comes out to uzbekistan, kazakhstan and belarus (for some reason) we all hold british passports and i hold a dual polish/british citizenship.

How hard would it be orginizing and actually completing this trip? we'd like to spent 3-7 days in each country to go hiking and see local cultures, are there any specific visa or travel restrictions to central asia? any limitations we should start thinking about now?

The initial travel plan was take a plane from the UK to tashkent, spend a few days in uzbekistan, a local bus to Almaty, then a plane to belarus, then back through poland.

I know this may seem like a whole lot but we want to do something different and that we'll actually remember.

Money isnt a large problem as were all Capable enough to save money for 2 years to each pay for our share of the trip.

Also we have this joke going of "3 tents". basically joking that we'll pack minimistically only taking a tent and absolute essentials each.

We'd all really love for this to go through and have a lovely first trip alone for all of us any other things we should thin about?