Yes, if it's a leylandii it can grow that fast.
As for cutting it down, you can buy a pruning saw quite cheaply and tackle your tree in sections. Wolf do a system where you can buy different length handles and then tool heads that slot on so you end up with a good set - hoe, rake, cultivator, lawn edger if you like and many more.
The pruning saw is usually a curved blade with strong teeth. They also have loppers which will cut branches and stems up to about 1" thick and then you may also find you need a decent set of secateurs - Felco no 2 are best to start with - assuming you are going to look after your garden and have other shrubs that need pruning for shape and health. Lots of Xmas prezzie potential there.
Start by grabbing the tree as high as you can reach and cut thru the central stem/trunk. You may need the help of a friend to hold a step ladder for you.. Reduce the tree height in sections till you have a stump about 2 or 3' tall. Use loppers to remove all side branches to leave a bare stump you can then use to lever the roots up. You can use an axe or the loppers to cut the thicker roots. The thinner ones will rot down in the soil but the bigger ones are best removed.
Do this when the tree is more or less dormant so between now and mid Feb. It will be less sappy. Wipe some oil on the sides of the blade firs and, if the pruning saw does get stuck with sappy stuff, clean it with some WD40. Clean again when you've finished.
Or you could just ask a friend to help or hire a tree surgeon.
Last edited: 09 November 2017 10:09:35