Highlander, Thank U for exhaustive answer:) I ordered trafarets

Highlander,
Thank U for exhaustive answer:)
I ordered trafarets to be manufactured professionaly, bought liquid tin and packs of balls, and a looooooot of flux (as U suggested:)
I hope to perfect skill to desolder and resolder chips without burn them or demaging them during process.
I`m very grateful for all help I recive form rom.by gentlman and great patience U have with novices like me, that have many stupid questions:))