In addition to nagdawi's answer:
انما العمال بالنیات
The reward of deeds depends upon the intentions. Not that it doesn't matter if you get the ablution right or wrong, but more than anything what matters is that you realize who you are doing this for and why? Perhaps if you realize that you can move away from on the how.
The significance of the why is what really should be important to you. Let's look into The Dua during Ablution:
While washing the hands before performing Wudhu, one should say:
O Lord! Make me of those who repent and purify themselves.
While rinsing the mouth one should say:
O Lord! Dictate to me the principles of faith on the Day I meet You, and make my tongue fluent with Your remembrance.
While washing the nose one should say:
O Lord! Do not deprive me of the fragrance of Paradise, and make me of those who smell its fragrance and per fume.
While washing the face, one should say:
O Lord! Make my face bright on the Day when the faces will turn dark. Do not darken my face on the Day when the face s are bright.
While pouring water over the right elbow, one should say:
O Lord! Give my book of deeds in my right hand, and a permanent stay in Paradise on my left, and make my reckoning an easy one.
While pouring water over the left elbow, one should say:
O Lord! Do not give my book of deeds in my left hand, n or from behind my back, nor chain it to my neck. I seek refuge in You from the Hell-fire.
While performing the wiping of the head, one should say:
O Lord! Cover me with Your Mercy, Blessings and Forgiveness.
While performing the wiping of the feet, one should say:
O Lord! Keep me firm on the Bridge (to Paradise) on the Day when the feet will slip, and help me in my efforts to do things which will please You, O' Glorious and Mighty!.
Basically this wudu is to help us see ourselves in the presence of Allah and see the afterlife very close. It's purpose isn't to just do something. So if you're spending time on just getting right, I humbly suggest you spend time on thinking it right and humbling yourself before Allah. Don't let waswas hold you back from more important stuff. Islam isn't about just bending,kneeling,prostrating to Allah, It's much more about humbling while knowing exactly why you do it.
To see the full Arabic dua see here