[NKosmatos]

Well, mainly two things: perseverance and/or obligation. If it’s work related you need to finish your tasks otherwise you risk loosing your job. If it’s something personal you either have to push your self and do it or it will go to the drawer of unfinished projects. Try breaking big tasks into smaller ones, allocate a fixed time where you’ll work an a specific (small) task, mute distractions (email, social networks...), mix boring tasks with something else interesting so that the traction/inertia of the good one will also push the bad one ;-), have someone else motivate you or check your progress, try doing these tasks while listening to music (if feasible).

[31337]

Perfectly written. Thanks.

To give a little insight of what is demotivating me, it is not the tasks that are big, instead it is the tasks that are just small and not mentally challenging. Simple but frequent and time consuming. It bothers me in a sense that whenever I work on these I just feel like a car where the gearbox is on a Neutral Mode. Not going further even though the engine is running.

[gshdg]

Automate them?

Give yourself a reward for doing them?

Gamify them? (Compete with yourself for how quickly you can complete them, for instance.)