Get yourself a UFS with HWK and practice with it on a few phones... once you get a hang of it you will have nearly all nokia's covered.
Smart Clip takes a bit of getting used to... especially with test points, as you have to dismantle the phones and remove heat shields.
Cruiser (once you get it installed) isn't too hard to get the hang of...and comes with a good manual (help pages)
But as a few others have already said start off with a UFS box and work up from there..
If you can try to avoid free solutions... not 100% safe if your working on customers phones... It pays to buy good equipment with good support in the long run..the more you invest the better the results
Good luck