I've been finding in the 20s and 30s that soloing is so fast that the only problem I have is the rate at which my vitality drops.
I'll likely need to adapt my tactics at higher levels, but currently I do very well just sending in the pet(s), throwing some nukes at the mob and then dots once the pet has moved forward and rooted/taken aggro, following which I can move in and add the odd smack without getting hit while throwing a few more nukes. I let the pet take the damage because he heals quicker, but even so I look for mitigation in my gear and with pretty well all my characters I only buy chest pieces that are imbued with a heal. Incidentally, I wish the broker had a separate category for all that fancy dress stuff you have to wade through page after page to find the proper adventuring gear.
If I get adds or it's a group encounter then I do an AoE mez and switch my target to assist the pet so I know which mob we're both concentrating on while keeping the others mezzed.
I know our pets usually cast Root for themselves, but do they ever mez? I haven't noticed that they do.