It is advisable to change the parking time especially if the drive is used. I would go with either disabled (if the drive is used), or 10-30 minutes or disabled if drive is new.
I would definitely get the transfer cable. It maybe possible to do without while hooked up to SATA instead of USB. I believe it probably is.
Your options with the transfer cable are much more and I have ended up using it a lot even after setting up the drive, for instance if you want to look at drive contents, copy files, etc. If you do not have RGH and network FTP the transfer cable will be your only way... well some (and only some) items you can transfer to the other drive or a flash storage device but you will not have the same understanding it is really dumbed down and limited. Also you're not going to want to keep hooking the drive up to SATA it is a pain and you have to change BIOS setting to IDE every time. What I do is the HDDHACKR part on a desktop through SATA, and the rest of it I do through the transfer cable on a laptop, that is how I prefer it.
You are probably going to need a desktop from at least 2 years ago or more for HDDHACKR to work on the chipset, so that is one thing that can stop you in your tracks. It will be dependent on your desktop BIOS whether it can read a flash drive of X size (I think?). I would order a smaller one if thats what it says to do, I am using a 64mb one, but probably if your desktop is newer it will work fine IDK you could try it out right now.
After changing to IDE I had to go back into my BIOS and from the exit screen launch the USB stick (it was listed in the exit menu screen for some reason under custom boot) in order to boot up DOS and HDDHACKR... well I had a dual boot system and that could be why but you have to figure out how to boot it first try changing the boot order and it should say "press any key to boot from USB" and if it does not you will have to figure out how in your specific BIOS, it pays to have 2 computers one to do it and the other to look up instructions or the BIOS manual