Shani Dev is the son of Sun God (Surya) and his wife Chhaya. Shani Dev is one of the Navgrahas as per Hindu astrology. Planet Saturn is an embodiment of Shani Dev, and Saturday is the specific day in the week associated with the lord.
There is a sense of fear which is invoked in most the people while praying to the lord, as Shani Dev's 'sadhesati' and 'dhaiya' make people dread their fate more. However, we must understand that the lord is also another name for justice, so each individual goes through whatever Karma he or she has done.
ALSO READ: Spirituality: Mantra for overcoming fear
Shani Dev should not be dreaded but prayed with utmost devotion, and then you shall feel the blessings of the lord showering upon you. In order to avoid all the obstacles in your life and to overcome any fear, chant these Shani Mantras to make you feel empowered.
Also, keep in mind that the lord helps those who help themselves. So, do your deeds with utmost honesty and see how you fare well in life. Love thy lord unconditionally!
Shani Dev Mantras:
ऊँ शं शनैश्चाराय नमः।
Om Sham Shaneicharaya namah
ॐ निलान्जन समाभासं रविपुत्रं यमाग्रजम।
छायामार्तंड संभूतं तं नमामि शनैश्चरम॥
" Om nilanjana samabhasam | Ravi putram yamagrajam || Cahaya martanda samhubhutam | Tama namami Shanescharam||"