I am as solo founder and successfully raised three Angel rounds.It can be done.

Investors want a list of attributes to properly litigate their risk involved for first time entrepreneurs. Namely, you need to demonstrate you are sharp, expert in your field, have 'skin in the game', a cleary focus, understand market and contingincies. If you don't have a team, be honest and transparent that the funds can be utilized to outsource extra help.

What I recommend are the following suggestions
-Have a beautifully designed pitch deck
- Basic mockup website
- Social content following
-Master your presentation skills

If you have a proof of concept have solid numbers, google analytics/trends of your market share and competitors in a business plan start scheduling meetings. I can send you two links of a pitch deck I used to raise 40k and a video I frequently use as a reference to what angels look .