Instead of using a weak qualifier:

I believe my background provides me with unique qualifications . . .

Use a stronger approach:

My background provides me with unique qualifications . . .

Instead of using a weak qualifier:

I feel very confident that I would be an asset . . .

Use a stronger approach:

I am confident that I would be an asset

Instead of using a weak qualifier:

I feel I can help the ABC Corporation to become more efficient . . .

Use a stronger approach:

I am convinced I can help the ABC Corporation to become more efficient .