I will pull by hand anything up to around 18" tall as these come easily bringing the roots with them. Larger trees get the chainsaw or bow saw treatment.... trouble is these ones will regrow as the roots remain in the ground.
In the middle are small trees up to 2" grirth and 6 foot tall that are too big to pull by hand but tempting to try... this usually ends with an aching back.
A device was needed to remove small trees with little effort. A look on line came up with a number of different ideas that ranged in cost from around £100 to £250. Being a cheapscate I decided to build my own!
Step 1: Tree puller from scrap.....
Second hand stilsons are easy to find and very cheap to buy, especially when, like the one I used, the stilson is incomplete.
As it did not have its adjustment nut it was a freebie :) Once modified this will grip the tree.