Depends on what type of job you do on it??.......if its a good job could lead to £££££££s but all it takes is one mistake and its fecked and believe me I've see many a good stock ruined through DIY attempts, there are some lads on here who have done their guns both professionally and DIY so if you want have a look back at the posts as it might give you some good ideas/hints before you make a start.
Good luck
Coney.