The original poster wishes to convert to Catholicism which leads me to assume he/she know something about it, and has some knowledge of the foundation upon which the Church stands. The next step is find and attend a church if not already doing so, and discuss RCIA with a priest and attend the meetings in which Catholic truth will be taught. It takes a while, there is no rush in this, and discussion is encouraged. The fact that being a member of the Mormon faith is not that important, the important thing is that, like the rest of us this person is a sinner seeking communion with Christ. Whether he/she chooses to officially leave the LDS is their decision to make, maybe at some later stage, or maybe not at all, the important thing is to move on into the Faith he/she has chosen, and then make these decisions when this person feels they are at the right stage to deal with them. The Mormon faith is built on Joseph Smith and has evolved its beliefs from him and his prophets, but they are not truth, they have no foundation in truth. Their programme of working out their salvation based on their works is fruitless, and a waste of time, and have no power whatsoever, so all their activities such as baptising the dead carry no weight with God. So having your name officially removed is not necessary in the eyes of God I am sure, but if it is something needed to tie up loose ends then that’s ok too, but not necessary… Becoming a Christian in its truist and purist form is all that is needed, if the sacrament of Baptism is required then rejoice, move onto confirmation and partaking in th Eucharist then rejoice all the more, because you have come home to Him…Allelujah