Guiding and fixing assembly, comprising a permanent fixing system for a furniture item and a hinge, the permanent fixing system being configured in order to rigidly connect a first panel to a second panel of the furniture item in an assembled position, the permanent fixing system comprising at least one first part, configured in order to be fixed to the first panel, and one second part, configured in order to be fixed to the second panel and to fit into the first part, - the first part comprising: ∘ a body comprising at least one first face, ∘ a receiving housing for a first barbed clip of the second part, the housing being hollow from the first face of the body of the first part and extending into the body of the first part, the housing comprising a retaining stop for the first barbed clip, configured in order to retain the first barbed clip permanently after it has been fitted in, and a receiving compartment for a head of the first barbed clip formed between a base of the housing and the stop, and ∘ a retaining system of the first part on the first panel formed on at least one face of the body of the first part separate from the first face, - the second part comprising: ∘ a body comprising at least one first face, ∘ at least the first barbed clip being configured in order to fit into the receiving housing of the first part, the first barbed clip projecting from the first face of the body of the second part and comprising at least one head and one arm which is connected to the first face and supports the head, and the head comprising at least one flange configured in order to be turned back during the insertion of the head into the housing and in order to spread out again when the head is in the receiving compartment of the housing, ∘ a retaining system of the second part to the second panel formed on at least one face of the body of the second part separate from the first face, - the hinge being configured in order to pivotably guide an insertion of the first barbed clip of the second part into the corresponding receiving housing of the first part, the first barbed clip and the receiving housing being curved respectively in the sectional plane perpendicular to at least one face of the body of the first part and to at least one face of the body of the second part in order to facilitate the insertion of the first barbed clip into the housing. - the first part comprising: ∘ a body comprising at least one first face, ∘ a receiving housing for a first barbed clip of the second part, the housing being hollow from the first face of the body of the first part and extending into the body of the first part, the housing comprising a retaining stop for the first barbed clip, configured in order to retain the first barbed clip permanently after it has been fitted in, and a receiving compartment for a head of the first barbed clip formed between a base of the housing and the stop, and ∘ a retaining system of the first part on the first panel formed on at least one face of the body of the first part separate from the first face, ∘ a body comprising at least one first face, ∘ a receiving housing for a first barbed clip of the second part, the housing being hollow from the first face of the body of the first part and extending into the body of the first part, the housing comprising a retaining stop for the first barbed clip, configured in order to retain the first barbed clip permanently after it has been fitted in, and a receiving compartment for a head of the first barbed clip formed between a base of the housing and the stop, and ∘ a retaining system of the first part on the first panel formed on at least one face of the body of the first part separate from the first face, - the second part comprising: ∘ a body comprising at least one first face, ∘ at least the first barbed clip being configured in order to fit into the receiving housing of the first part, the first barbed clip projecting from the first face of the body of the second part and comprising at least one head and one arm which is connected to the first face and supports the head, and the head comprising at least one flange configured in order to be turned back during the insertion of the head into the housing and in order to spread out again when the head is in the receiving compartment of the housing, ∘ a retaining system of the second part to the second panel formed on at least one face of the body of the second part separate from the first face, ∘ a body comprising at least one first face, ∘ at least the first barbed clip being configured in order to fit into the receiving housing of the first part, the first barbed clip projecting from the first face of the body of the second part and comprising at least one head and one arm which is connected to the first face and supports the head, and the head comprising at least one flange configured in order to be turned back during the insertion of the head into the housing and in order to spread out again when the head is in the receiving compartment of the housing, ∘ a retaining system of the second part to the second panel formed on at least one face of the body of the second part separate from the first face, - the hinge being configured in order to pivotably guide an insertion of the first barbed clip of the second part into the corresponding receiving housing of the first part, the first barbed clip and the receiving housing being curved respectively in the sectional plane perpendicular to at least one face of the body of the first part and to at least one face of the body of the second part in order to facilitate the insertion of the first barbed clip into the housing.