I have a mature firethorn growing on the front of my house planted by the previous owners. I pruned it back at the start of the summer but it is growing over the windows again. In addition to branches growing in front of the windows I feel like I'd like to be able to reduce the overall thickness and height of the bush in places.
The bush is maybe around 30 - 50 cm in thickness in front of the house which makes it very awkward for me to get a ladder resting against the side of the house to prune it. I've so far used garden shears and a branch lopper to cut back the branches growing in front of the windows. The problem with the shears is that many of the branches are too thick for the shears to cut, the problem with the branch lopper is that it is very slow and they are awkward to use at the top of a ladder.
So my question is which tool would be better for this type of job? Should I be considering a small chainsaw? Is it easy to use a chainsaw? What about at the top of a ladder?
Any suggestions appreciated. I am a pretty novice gardener, we've lived in this house a year and a half and our previous house had no garden.