Witchcraft is a generic term which encompasses more than just spells, and not everything cast against a person is a spell. They don't always fit under the umbrella of spell, at various times, as well.
Reasons why one may need protection from witchcraft can include:
Association with someone who is often a target.
Their own workings backfiring.
Any sort of backlash that they might believe in.
Irritating another practitioner directly.
Or another reason entirely.
Protective symbols and amulets are very common. People wear many symbols ranging from triquetras and pentacles to crosses and Stars of David. Depending on your beliefs and preferences, this might be something to look into.
Spells actually can be easy, depending on your personal paradigm. Some people believe that no matter how intricate or simple the process of a spell is, all you need is the belief behind it, while others may believe that the process is the entire spell, and furthermore there are witches who believe in a mix of those two or something else entirely.
Looking for simple things to do, like basic hand gestures, cleansings, and protections is actually possible. Crossing fingers has been viewed as a way to protect against curses. Adding common herbs like sage, rosemary, thyme, and/or lavender to baths is seen as a way to cleanse the body and soul of negativity without having to do very much except add herbs to a bath and bathe.
So yes, take the time to look through the spells and articles here on SoM, you will find plenty of spells, charms, talismans, and ideas that you can use in their posted form or in one that suits your needs, capabilities, and/or availability.