The most difficult part of filing a lien is making sure you complete each required step within the correct timeline. 
To place a mechanic’s lien in Alaska, if a Notice of Completion is not recorded by the property owner, the Claim of Lien must be recorded no later than 120 days after the completion of the construction contract or the last day it provided materials or labor to the project.
Lien claimants who receive advance notice of a filing of a Notice of Completion by the owner have 15 days thereafter to file an Alaska claim of lien.
If the lien claimant has not given a Notice of Lien Rights (pre-lien), it also has 15 days to file a claim of lien after the recording of the Notice of Completion.
A lien claimant who recorded a Notice of Lien Rights (pre-lien) has 90 days after either the completion of the construction contract or the last day it provided materials or labor to the project.
Once the lien has been recorded, Alaska law does not require that a lien claimant serve the recorded lien on the owner.