Sounds like a great idea.
Good luck lukx.
You already have the knowledge in your brain and in this website, don't give up just yet!
but how long should the line last before changing it???
In case you choose to <no pressure>, some info and pointers about this kind of training method have been put out in the past.
Good ole' Sit Down Challenge: {from my bookmarks with brief explanations; in no particular order}
NLA, sit down challenge, line
http://kreslik.com/forums/viewtopic.php?p=16903#16903
NLA, sit down challenge line, stops sized correction, retracements
http://kreslik.com/forums/viewtopic.php?p=16874#16874
NLA, MO's plan for procharged, reinvesting profits, sit down challenge, Mighty Line
http://kreslik.com/forums/viewtopic.php?p=16874#16874
NLA, stopssized below largest correction, retracements, sit down challenge line
http://kreslik.com/forums/viewtopic.php?p=16868#16868
NLA, sit down challenge, MO's plan to procharged, Mighty Line challenge
http://kreslik.com/forums/viewtopic.php?p=16842#16842
NLA, sit down challenge line, inflating stops retracements corrections
http://kreslik.com/forums/viewtopic.php?p=16822#16822
NLA, sit down challenge line, inflating stops correction retracements
http://kreslik.com/forums/viewtopic.php?p=16855#16855