Yeah. Also,
creating a GUI = easy (low VB skills involved at least)
Browsing for .dlls = easier than adding them to a folder and auto-importing
Listbox = easy
Changeable timer = easy
Injection method = HARD
So you've successfully done the easy bits, but not the hard bits? There are millions of injectors in like every section that just leech the injection method, slap on some features and away they go.