Your question arrived too late for a reply in February, and we wrote to you at the address you gave, but the letter was returned from dead-letter office. Keep your grafts back in a cool place, and graft as you propose, after the shoots have broken into leaf in the stock - not before, or the stocks will bleed. Another method is "bottle-grafting," which is to put the end of the scion or graft in a bottle of water and splice it to the stock. If you have young plants, the most perfect union is formed when green wood is spliced to green wood.