The procedure you posted is for a leuckart reaction, which will yield MDA as written. Not MDMA, which I assume is what you are after. You could use N-methylformamide in place of formamide in the above reaction however it is not recommended. I would not personally recommend the above synth if this is your first time synth. If you say you have access to formic acid et al. I would suggest looking at rhodiums site (see link at bottom of page) and under Chemistry>Epoxide related>Peracid oxidation of isosafrole to MDP2P follow the synth for a buffered performic, or try Chromic's Propenylbenzene Oxidation to P2P's using Peracetic Acid. These should be easier, more predictable, and higher yielding, with less impurites that may or may not be associated with leuckarts. ;)
I also just posted a procedure for titrating H2O2 Post 461708 (https://www.thevespiary.org/talk/index.php?topic=10218.msg46170800#msg46170800)
(methyl_ethyl: "Failed Peracid Oxidations? Check your H2O2 conc.!!", Newbee Forum) which may be a good idea before preparing your peracid, as said solution seems to degrade over time, which may cause the reaction to fail IMO....
good luck,
m_e
EDIT:: Sorry Hypo, you beat me to it, (I have been having problems posting this for some reason) :(