How to fix these external render issues for painting?

I'm renovating my whole house during lockdown, and there's so much to do!

I wanted to paint the exterior, but realised there are a few issues with the render. What is the best course of action to deal with these considering I've never done any rendering before. Or is it worth paying someone to do it if I'm a complete amateur.

You can see how its been patched up before and has a mix of pebble dash and flat, which isn't great, but I'm not too fussed about the back of the house being perfect.

I have indoor plastering tools, can these be used for rendering outdoors too?

Thanks

 

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