How Easy: a Mate and I put my 2nd TT-01 Together from Scratch and Dialled in in 2Hours.
If you ever played with Lego or Mechanno then you can assemble a TT-01

My Advice is to buy the Hop Ups prior to Your Assembley.
Get the Ball Bearing kit and Alloy prop shaft before you reven think of building one.. It Saves an Aweful lot of Time..

Most TT-01 Kits come with a TEU101BK ESC and a 27T Silvercan motor but you will need to by a 2-Channel Pistol Grip Controller with Reciever and Servo to make the kit complete..