Well harm is personal opinion, to get this desired job would require another person not getting the job. You could end the spell by saying 'harm none' but again, do you just mean physical harm because you can harm someone emotionally. [Not to be a downer] you could try a green candle spell and visualize you being hired. [Carve your desire on the candle helps too] But there are a number of job spells to choose from [if I remember a good one I'll mail you]
For your second one you should definitely do a cleansing. I'm not too sure what you're trying to move past, but if it's something like a breakup consider getting rid of [or packing away] everything from your old life you no longer need. Cleansing will bring new energy and you should feel different when it's over. Regular cleansings [and protections] are a good habit to get into.
You could also look into a new years ceremony or some other similar ritual. Like write a list of everything that has held you back, you wish to change, and basically everything from the past you want rid of. Burn the list [be safe and do it in the sink or a flame resistant pot] then take these ashes and bury them along with a seed [best done in a pot] then charge it with energy and visualize your desired future. Whenever you see the plant growing remember how you too are growing.