Repair plaster after restumping

[Helen]

My house has now been restumped, I some cracking, around brick fireplace/mantle & corners of some windows are worst. Wondering how to go about this repair job, guess it will be a bit messy, have a little bit of idea but maybe there are a few tips to make the job easier!

[Jason]

Good luck with the repairs @Helen.

I'm sure Workshop members will have some great tips for you.

The following video should also be helpful.

Jason

[AHoy]

It would be good if you could share some photos of what you are up against @Helen. 

[BIM_Engineer]

@Jason How is that video helpful, when the severity of the problem isn't know... Just Curious
":...cracking, around brick fireplace/mantle & corners of some windows are worst" Quote
@Helen.. What does that mean?
First you need to determine if the cracks are Structural or Non-structural in nature as @AHoy said ".. you could share some photos?"
Otherwise people that can assist will ignore your post..sorry to be blunt
As an Engineer I look at 100's of photos a week..save clients $1000's
If there is an urgent need I'll advise you accordingly, ie approx. fix, time involved and the cost,etc,etc