Yes, correct. Methyl transferases are aa class of enzyme add a methyl group to proteins (here, histones). In terms of gene transcription, methylation is a major way of regulating which genes are active and which are not. Histone methyltransferases target histones and change the packaging status of the nucleosomes, thereby changing accessibility of the DNA.
Regulation of which protein is made and when can be regulated at multiple levels. Match the regulation method with the stage that they regulate.
LaNts and Laminins 