I'll show you how to assemble a Bailey DRDII 30G Slab Roller. It's a large piece of equipment but it won't be difficult with these easy steps. The roller unit is heavy so having two people for that step is preferable, but not absolutely essential.

Here's the tools used:
(2) 14mm wrenches or (1) 14mm wrench and (1) 14mm socket and socket wrench.
(1) Slotted screwdriver or (1) 8mm driver/socket
(Optional) Drill to drive screws
(Optional) clamps to hold things in place if working alone