This is the version with the hanger to attach it to the bike frame (rather than direct mount) - do check which one yours is before ordering.
I'm a novice when it comes to bike maintenance, but I can say fitting this was very straightforward. Don't be put off by the various adjustments you need to make to get the gears to change accurately, as there are numerous YouTube videos that step you through the process. Took about 15 mins to fit the derailleur and about another 25 mins to get it adjusted correctly. With a few squirts of WD40 the bike changes gear much more smoothly now. Pleased.