This Articulated Ant requires no assembly if you choose the version without Antennae and requires minimal assembly if you want Antennae.
The antennae are made by inserting short pieces of filament into the holes in the head of the regular version of this model. They should fit by friction, but if you want to be sure that they don't fall off you can either melt the end of the filament or add glue to the holes. You can also resize the holes in the slicer.
If you have poor bed adhesion you may need a Brim.