You may want to test your renderings at Quality 3 and low resolution (say 300x400 or something) before you do a high quality render. That way you will get an idea of how a high resolution (Q4, 1000+x1200+) will work. If it does not, change time, place and light-sources.

There are many good hints on the site which can help you get it right. Look in the blog and for posts by Ceciliabr and enkonyito

ok

PS - you can use Blender (or other software) which allows you to use other renderers, but that could take a lot of time if you are not an experienced user.