Method for installing a plurality of ducts/cables in an area for building a distribution network and/or an access network; said area comprising a first layer and a second layer; said first layer being a road layer, such as asphalt or concrete, and said second layer being a bearing layer for and located below said first layer and consisting of for example sand, gravel, stones and dirt; said method comprising the steps of; - designing a network layout for said distribution network and/or said access network in said area; wherein said network layout prescribes installation of a plurality of ducts/cables in at least one main micro trench; said network layout further prescribes at least one splicing point and/or at least one branch connected to said at least one main micro trench for the connection of a final destination such as a property, a building or a family home; - arranging said plurality of ducts/cables according to said network layout; - sawing said at least one main micro trench in said area through said first layer and into said second layer using a sawing machine comprising a diamond saw blade arranged for up-cut rotational direction; said sawing machine further comprising a stabilizing device, during operation positioned immediately behind said diamond saw blade in said micro trench and having a front part with a shape complementary to the shape of said diamond saw blade; wherein said diamond saw blade and said stabilizing device are arranged so that their respective working depths may be adjusted in order to adjust a laying depth; wherein said working depth for said stabilizing device is less than said working depth for said diamond saw blade; - stabilizing the walls of said second layer in said main micro trench by means of side elements of said stabilizing device; - installing said plurality of ducts/cables into said second layer below said first layer of said main micro trench according to said network layout, by means of at least one guiding means comprised in said stabilizing device; wherein said sawing, said stabilizing and said installing are carried out in one process; - successively routing each one of said at plurality of ducts/cables to its endpoint; said endpoint being one of said at least one splicing point or one of said final destinations connected through one of said branches, according to said network layout; - refilling all said micro trenches to a suitable level with a suitable filling material after said plurality of ducts/cables have been routed to their said endpoints; - sealing said micro trench with a suitable sealing material. - designing a network layout for said distribution network and/or said access network in said area; wherein said network layout prescribes installation of a plurality of ducts/cables in at least one main micro trench; said network layout further prescribes at least one splicing point and/or at least one branch connected to said at least one main micro trench for the connection of a final destination such as a property, a building or a family home; - arranging said plurality of ducts/cables according to said network layout; - sawing said at least one main micro trench in said area through said first layer and into said second layer using a sawing machine comprising a diamond saw blade arranged for up-cut rotational direction; said sawing machine further comprising a stabilizing device, during operation positioned immediately behind said diamond saw blade in said micro trench and having a front part with a shape complementary to the shape of said diamond saw blade; wherein said diamond saw blade and said stabilizing device are arranged so that their respective working depths may be adjusted in order to adjust a laying depth; wherein said working depth for said stabilizing device is less than said working depth for said diamond saw blade; - stabilizing the walls of said second layer in said main micro trench by means of side elements of said stabilizing device; - installing said plurality of ducts/cables into said second layer below said first layer of said main micro trench according to said network layout, by means of at least one guiding means comprised in said stabilizing device; wherein said sawing, said stabilizing and said installing are carried out in one process; - successively routing each one of said at plurality of ducts/cables to its endpoint; said endpoint being one of said at least one splicing point or one of said final destinations connected through one of said branches, according to said network layout; - refilling all said micro trenches to a suitable level with a suitable filling material after said plurality of ducts/cables have been routed to their said endpoints; - sealing said micro trench with a suitable sealing material.